You can use the RealTrack Edit Mode now to cut copy move resize, though you can't copy the section to a new track, if it had that then you could build up your drum track just how you like.

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I made up one for Reaper that you could add a drum riff but the source tracks had riffs recorded in them

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I don't know how you would do the multiriff drums as they just play patterns for different sections see text below of a drum style.

Code
wavename=CountrySwing_120_Style.wav
OFFSET=-12
dbAdjust=-10
MULTIBARPATTERNPERCENT=60
Pushamount8=40
Pushamount16=30
pattern,Count-in,0,5,0,2,-1  
pattern,PostFill,a,6,0,8,1   ;8 bars
pattern,PostFill,a,6,0,8,9
pattern,PostFill,a,6,0,8,17
pattern,Normal,a,1,2,7,2   ;7 bars
pattern,Normal,a,1,2,7,10
pattern,Normal,a,1,2,7,18
pattern,Normal,a,1,2,7,10
pattern,Normal,a,1,2,7,18
pattern,Normal,a,5,3,6,3   ;6 bars
pattern,Normal,a,5,2,6,2
pattern,Normal,a,5,3,6,11
pattern,Normal,a,5,3,6,19
pattern,Normal,a,5,4,5,4   ;5 bars
pattern,Normal,a,5,8,5,12
pattern,Normal,a,5,4,5,20
pattern,PostFill,a,6,0,4,1   ;4 bars
pattern,Normal,a,5,1,4,5
pattern,Normal,a,5,2,4,2
pattern,Normal,a,5,3,4,3
pattern,Normal,a,5,4,4,4
pattern,Normal,a,5,5,4,5
pattern,PostFill,a,6,0,4,5
pattern,PostFill,a,6,0,4,9
pattern,Normal,a,5,5,4,13
pattern,PostFill,a,6,0,4,17
pattern,Normal,a,5,1,4,21
pattern,PostFill,a,6,0,4,21
pattern,Normal,a,5,2,3,2     ;3 bars
pattern,Normal,a,5,2,3,6
pattern,Normal,a,5,2,3,10
pattern,PostFill,a,6,0,2,1   ;2 bars
pattern,PostFill,a,6,0,2,2
pattern,Normal,a,5,0,2,2
pattern,Normal,a,5,1,2,3
pattern,Normal,a,5,2,2,4
pattern,PostFill,a,6,0,2,5
pattern,Normal,a,5,5,2,5
pattern,Normal,a,5,2,2,6
pattern,Normal,a,5,6,2,6
pattern,Normal,a,5,3,2,7
pattern,PostFill,a,6,0,2,9 
pattern,PostFill,a,6,0,2,11
pattern,Normal,a,5,3,2,11
pattern,Normal,a,5,1,2,13
pattern,Normal,a,2,3,2,15
pattern,PreFill,a,5,0,2,15
pattern,PostFill,a,6,0,2,17
pattern,Normal,a,3,3,2,19
pattern,Normal,a,5,1,2,21
pattern,Normal,a,3,3,2,23
pattern,PreFill,a,5,0,2,23
pattern,PostFill,a,6,0,1,1   ;1 bar
pattern,PostFill,a,6,0,1,2
pattern,Normal,a,5,2,1,2
pattern,Normal,a,5,0,1,2
pattern,Normal,a,5,3,1,3
pattern,Normal,a,5,0,1,3
pattern,Normal,a,5,4,1,4
pattern,Normal,a,5,1,1,5
pattern,Normal,a,5,2,1,6
pattern,Normal,a,5,3,1,7
pattern,Normal,a,5,4,1,8
pattern,Normal,a,5,5,1,5
pattern,Normal,a,5,6,1,6
pattern,Normal,a,5,7,1,7
pattern,Normal,a,5,8,1,8
pattern,Normal,a,5,0,1,5
pattern,Normal,a,5,0,1,6
pattern,Normal,a,5,0,1,7
pattern,Normal,a,5,0,1,8
pattern,Normal,a,5,1,1,9
pattern,Normal,a,5,2,1,10
pattern,Normal,a,5,3,1,11
pattern,Normal,a,5,4,1,12
pattern,Normal,a,5,1,1,13
pattern,Normal,a,5,2,1,14
pattern,Normal,a,5,3,1,15
pattern,Fill,a,5,0,1,16
pattern,PostFill,a,6,0,1,17
pattern,Normal,a,5,0,1,18
pattern,Normal,a,5,0,1,19
pattern,Normal,a,5,4,1,20
pattern,Normal,a,5,1,1,21
pattern,Normal,a,5,2,1,22
pattern,Normal,a,5,3,1,23
pattern,Normal,a,3,4,1,24
pattern,Fill,a,5,0,1,24
;B section
pattern,PostFill,b,6,0,8,25
pattern,PostFill,b,6,0,8,33   ;8 bars
pattern,PostFill,b,6,0,8,41
;pattern,Normal,b,3,2,7,26   ;7 bars
;pattern,Normal,b,3,2,7,34
;pattern,Normal,b,3,2,7,42
;pattern,Normal,b,3,6,7,34
;pattern,Normal,b,3,6,7,42
;pattern,Normal,b,3,3,6,27   ;6 bars
;pattern,Normal,b,3,3,6,35  
;pattern,Normal,b,3,3,6,43
;pattern,Normal,b,3,7,6,43
;pattern,Normal,b,3,4,5,28   ;5 bars
;pattern,Normal,b,3,4,5,36   
;pattern,Normal,b,3,4,5,44
pattern,PostFill,b,2,0,4,25 ;4 bars
pattern,PostFill,b,2,0,4,29
pattern,PostFill,b,2,0,4,33
pattern,PostFill,b,2,0,4,37
pattern,PostFill,b,2,0,4,41
pattern,PostFill,b,6,0,4,45
pattern,PostFill,b,8,0,2,25   ;2 bars
pattern,PreFill,b,5,0,2,27
pattern,PostFill,b,1,0,2,29 
;pattern,Normal,b,5,1,2,30
;pattern,Normal,b,5,0,2,30
;pattern,Normal,b,5,3,2,30
;pattern,Normal,b,5,5,2,30
pattern,PreFill,b,5,0,2,31
pattern,PostFill,b,4,0,2,33
;pattern,Normal,b,5,1,2,34  
;pattern,Normal,b,5,0,2,34
pattern,PreFill,b,5,0,2,35
pattern,PostFill,b,2,0,2,37
pattern,PostFill,b,2,0,2,34
pattern,PreFill,b,5,0,2,39
pattern,PostFill,b,6,0,2,41
pattern,PreFill,b,5,0,2,43
pattern,PostFill,b,6,0,2,45
pattern,PreFill,b,5,3,2,47
pattern,PostFill,b,6,0,1,25   ;1 bar
pattern,PostFill,b,6,0,1,26
pattern,Normal,b,5,2,1,26
pattern,Normal,b,5,0,1,26
pattern,Normal,b,5,3,1,27
pattern,Normal,b,5,0,1,27
pattern,Fill,b,5,0,1,28
pattern,PostFill,b,6,0,1,29
pattern,PostFill,b,6,0,1,30
pattern,Normal,b,5,2,1,30
pattern,Normal,b,5,0,1,30
pattern,Normal,b,5,3,1,31
pattern,Normal,b,5,0,1,31
pattern,Fill,b,5,0,1,32
pattern,PostFill,b,6,0,1,33   
pattern,Normal,b,5,2,1,34
pattern,Normal,b,5,0,1,34
pattern,Normal,b,5,3,1,35
pattern,Fill,b,5,0,1,36
pattern,PostFill,b,6,0,1,37
pattern,Normal,b,5,2,1,38
pattern,Normal,b,5,3,1,39
pattern,Fill,b,5,0,1,40
pattern,PostFill,b,6,0,1,41
pattern,Normal,b,5,2,1,42
pattern,Normal,b,5,3,1,43
pattern,Fill,b,5,0,1,44
pattern,PostFill,b,6,0,1,45
pattern,Normal,b,5,2,1,46
pattern,Normal,b,5,3,1,47
pattern,Fill,b,5,0,1,48
pattern,Ending,0,5,0,2,49    ;2 bars
pattern,Ending,0,5,0,2,51    ;2 bars 
pattern,Fill,a,5,0,1,53
pattern,Fill,a,5,0,1,54
pattern,Fill,b,5,0,1,55
pattern,Fill,b,5,0,1,56
Shot,0,56,478,344,5,110   ;kick
Shot,0,57,343,248,3,100   ;snare
Shot,1,58,112,340,3,80   ;crash and kick 1
Shot,1,59,412,440,3,80   ;crash and Snare
Shot,1,61,226,400,4,90   ;crash2 and kick 
Shot,1,57,343,230,1,100   ;snare

;this style uses 65 bars. 20 megs