m7b5#2 is supported as m9b5 in BIAB.

m7+11.. if you mean by that an added 11th then just type m11 and it should work.
If you mean m7#11 which includes the 5th in the first octave and the b5 then it's not supported.


m9+5 I assume means m9#5 isn't supported but there are ways of approximating the sound with inversions.
Cm9#5 is another Locrian #2 chord which is a mode of melodic minor. Any other chord/mode of melodic minor can be used with the locrian#2 root as an alternate bass note. For cm9#5 I like quickly alternating D7b5b9b13/C with Ab5b/C on 2 beats using an 8th note push for the second chord.
It's amazing how many unsupported chords you can get using this method.

Cheers

Alan