Tested v5 for about 2 hours in GFay and about 30 min in the bazaar. (This was on my WE Ranger [my trader])
Only issue was having to re-activate Hotkey using ctrl-h (or alt-h LOL.) That was corrected by using the uneven bar.
I will be switching to this on my BST (play him more) and continue testing. Have had issues with him and the guild and group windows not updating properly, but I believe that is EQ and not the UI I am currently using with him.
Thanks to Elezibeth for the concept and Enok for the coding