your plugin seems popular... just a suggestion to enable your plugin data to integrate better with other plugins:
The structure of cimy_uef_data seems to be pretty much a replica of usermeta.
Why not use usermeta? This would enable other plugins that can find/deal with usermeta to see cimy data too.
You'd have to change fieldid to be more meaningful - maybe use the cimy field name as the wp meta key ?
(i like to work with wordpress as much as possible rather than creating extra tables - it usually pays off)