The connector should read the table prefix from the phpbb config files... so it should find the new table prefix... now for the default phpbb2 directory you need to either rename it to forum or change the forum directory setting to match...
Once more question (hopefully!)....on the phpbb board users avatars aren't showing up anymore as they use to. Am I missing a setting to have those show up as before?
The avatar code needs a little work in the v1.0.3...(and before)... for v2.0.0 I am going to temporarily disable the code while I look at how it is working and see if it can be improved...
Somewhere on this forum is instructions on how to disable the avatar sync feature... if you want to do that and can't find the post let me know and I will retype something...