There is going to be a new v5 Dutty ROM out within the week.
He has been playing with WinMob 6.1 and beta testing it with a few people. Dutty has been without his Kaiser for a few weeks but got it back the other day. Have a look at the last few pages of the v4 thread (pages 274 onwards i think).
Looking forward to this. There isn't much of a performance improvement over v4 so far, but there are a few nice fixes in 6.1, especially where BlueTooth is concerned.