It is already in the Biab code, as Reaper just plays the Biab data section direct.
Implementing NDE code, maybe way down the track or not at all ? the BB Plugin/Standalone is way easier.

You have the RT Hold db adjust deep down in the soloist dialog (it should adjust the Pushes as well ?).
You could Freeze the tracks and save the SGU then close it, then adjust the Hold level,
then open the SGU and generate to see where it is.
But that is no easy task like is being done in Reaper non destructively.

This would be like the current track data that is stored in a frozen SGU, you have "RiffdbOffset"
so Biab should be able to apply an offset to the current track RT data then re-write it back to RAM giving you the level adjust, without having to implement NDE.

Code:
Riff #	Summary	RiffHasData	SourceWAVFileName	SourceWAVFileTempo	SourceBarNumber	SourceBeatNumber	SourceTimeSig	SourceStartTimePPQ1200	*SourceBar	*SourceTick(120)	SourceTickOffsetPPQ1200	SourceEndTimePPQ1200	*Tick Duration120(calc)	*Beats Duration (calc)	SourceEndRiffStretchAmountPPQ1200	SourceEndRiffTransitionAmountPPQ1200	DestinationStartTimePPQ1200	*Chord	*Bar Destination 	*Beat Destination 	*Tick Destination120 	TranspositionSemitonesRequired	ThisRiffIsaPush1200	ThisRiffNumber	RiffNoneHoldShot	RiffHoldsLibraryNumber	ThisIsaPush	ThisisDrums	RiffdbOffset	RiffSoloistNumber	RiffThisRiffStartShouldBeMergedWithEndOfPreviousOne	RiffIsUnknownMonoStereo	RiffIndexFromMultipleRT	RiffMultipleRealTracksNumber	AnyLoopActive	AnyLoopRestartLoopWhenWavEnds	AnyLoopBaseTempo	AnyLoopNumberOfBeats	AnyLoopTransposeAmount	AnyLoopStretchTempo	AnyLoopTranspose	AnyLoopOriginalKeyMod	ChordLoopActive	ForceUsePlusMinusRealtracks	RiffPanning	RiffInstructionFutureBytes
0	Riff 0:4:117 to 3:1:3, dur=967, beats=8, ticks=+7,leadin120=-3	1	D:\bb\RealTracks\Bass, Electric, PopPowerA-B Ev 120\bs2151.WAV	120	103	1	4	499171	102	477	0	508845	967	8.06	0	0	9571	D	0	4	117	0	0	2129	0	0	0	0	0	1523	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,	
1	Riff 2:4:65 to 3:1:119, dur=175, beats=1, ticks=+55,leadin120=395	1	D:\bb\RealTracks\Library\Holds\Holds_152\SH1522.WAV	120	1	1	4	13554	1	395	0	15304	175	1.46	0	0	18650	^D	2	4	65	0	1	121	1	152	1	0	-2	1523	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,	
2	Riff 3:2:1 to 7:1:1, dur=1801, beats=15, ticks=+1,leadin120=121	1	D:\bb\RealTracks\Bass, Electric, PopPowerA-B Ev 120\bs2159.WAV	120	3	1	4	20416	3	121	0	38432	1802	15.01	0	0	20416		3	2	2	0	0	18713	0	0	0	0	0	1523	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,	
3	Riff 7:1:0 to 7:4:118, dur=479, beats=3, ticks=+119,leadin120=0	1	D:\bb\RealTracks\Bass, Electric, PopPowerA-B Ev 120\bs2159.WAV	120	42	1	4	206409	42	0	0	211200	479	3.99	0	0	38409	Dsus	7	1	1	0	0	18905	0	0	0	0	0	1523	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,	
4	Riff 7:4:115 to 8:4:115, dur=481, beats=4, ticks=+1,leadin120=-5	1	D:\bb\RealTracks\Bass, Electric, PopPowerA-B Ev 120\bs2157.WAV	120	42	1	4	206352	41	475	0	211168	482	4.01	0	0	43152	Asus	7	4	115	0	0	15893	0	0	0	0	0	1523	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,	
5	Riff 9:1:2 to 9:2:119, dur=238, beats=1, ticks=+118,leadin120=242	1	D:\bb\RealTracks\Bass, Electric, PopPowerA-B Ev 120\bs2165.WAV	120	133	3	4	645622	133	242	0	648008	239	1.99	0	0	48022	G A	9	1	2	0	0	30783	0	0	0	0	0	1523	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,	
6	Riff 9:3:0 to 10:1:3, dur=244, beats=2, ticks=+4,leadin120=0	1	D:\bb\RealTracks\Bass, Electric, PopPowerA-B Ev 120\bs2165.WAV	120	140	1	4	676804	140	0	0	679248	244	2.04	0	0	50404	A	9	3	0	0	0	30844	0	0	0	0	0	1523	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,	
7	Riff 9:4:117 to 10:2:118, dur=242, beats=2, ticks=+2,leadin120=-3	1	D:\bb\RealTracks\Bass, Electric, PopPowerA-B Ev 120\BS2170-1.WAV	120	11	1	4	57577	10	477	0	60000	242	2.02	0	0	52777	Bm G	9	4	118	0	0	40392	0	0	0	0	0	1523	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,

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