I don't know if you're still reading these... But I just registered to say NICE WORK ON THIS! I've been able to modify it a bit to fit with the needs of my forum, and it's really great! Nice work!
If you do happen to still be around, did you ever get to adding a limit to the number of times a person can like per day? That is an absolute must for me because my forum members are insane and will absolutely abuse this if there isn't the option... Bunch of crazies.
The only other feature that I think would be cool is if you added a dynamic alt code that changed based on how many likes a person received... so while hovering over a value of 0-10 would say something like "this person is terrible... 11-20 "this person is getting noticed"... 21-30 "whatever whatever" etc, etc.
AGAIN, REALLY GREAT MOD!!
I haven't seen you very active since early this year so I hope you get this message.