If you look at the forumns you can see people are jumping through hoops trying to get Bmax working on pearpc, why not save all that hassle and release the win32 Bmax as command line driven until the ide is done...its clear theres loads of people willing to put up with a little extra hassle.
Because they want help catching the Mac bugs, and all those people who are struggling are currently among those likely to help do that.
Because they don't want to have to struggle through Windows bugs as well.
You know BRL well enough by now to know that they're not Homer Simpson so they're not going to cave if you say "Can we have it please, dad?" a hundred times.