I like the idea, and it gives me something else to work on which keeps me playing. However it really makes me want to just solo. The zones are obscure enough and its different for everyone.. If you have the 'quest' on your ring, everyone who kills that mob should get the rank %, maybe at a reduced number like experience. Sharing ring rank with someone who can't even get the rank is annoying.
PK gear - I would rather drain someones eq for a wispy/faint mote than give it back to them.
Bright/Brilliant motes - I imagine trash NV and true-seeing items will be spammed, but the good ones won't get drained. If you Combine 10 faint to get a wispy, 10 wispy to get a glowing, 10 glowing to get a bright, 10 bright to get a brilliant, or something it would still allow you another option than spamming NV loads for brights/brilliants.