It is a very good idea to center the BIAB tracks before you export to wav.
The RTs that export as stereo tracks will, in fact, reflect the panning when exported. That can sometimes become a problem (like if you have something panned to one side and decide you would rather have it panned to the other.

Some RTs export as mono tracks - for those it does not matter - but still a good practice to center everything before exporting.

You also might consider removing the reverb that BIAB applies (set that to 0) - so that you can have control of that in your DAW as well...

Keep in mind that the panning in BIAB is based on -63 to 63 (L to R). If your DAW is based on 100 Left and 100 Right you need to adjust for that.

There is a setting somewhere in the menus (don't use it so I don't know where) that will set all the tracks to CENTER and all the reverbs to 0...

I'm sure there will be those who argue against this, but I also set the volumes to 127 (max) before exporting....