i think if you open a BIAB file in RB you lose the fx - reverb and eq that BIAB builds into the style.

but if you drag and drop the master button to the wav drop area and then when the wavs have all been generated drag the wavs in to RB you'll get audio tracks with the original BIAB fx incl reverb.

i always make sure that when i open RB, the blank RB track has the same key set as the BIAB file and the same bpm. only drawback is that the chords don't transfer over so you'll have to reinterpret them and they don't always match the BIAB chords you entered exactly (at least that's what i've found). BUT if you don't need to generate new tracks - jsut record vocal or such then that doesn't matter.

i'm sure more expert BIAB and RB users can give you some more advice.

you'll need to use the DAW setting in BIAB to make the window smaller and to keep it on top when you are dragging and dropping but tis all in the manual.