RB is light years ahead of BiaB in this aspect, just sayin'
There's a working Delphi example in house .. RB even uses BiaB generating engines, so it can be done.
Not sure why it hasn't.
Then again I always worry about a slow merger of RB & BiaB .. I like the workflow in RB, myself, so resist it becoming more like BiaB

Went and pulled up a SEQ file as an example below
Details are in the picture, but it is drums correctly rendered in 7/4 in RB with no 'gimmicks', just rendered.
5 or 6 tracks in this song were rendered in 7/4 without issue
pics or it didn't happen, right?

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OddTimeGen.jpg (95.42 KB, 281 downloads)

I do not work here, but the benefits are still awesome
Make your sound your own!