Users last week average time online

I'm quite tired of users that connect to Slsk only a few hours per week as probably they connect only when they need something and, as they finished their download, disconnect letting my downloads "awaitig user" for weeks. Seeing their "last-week-avarage-online-time" [in %] when you get user info could help preventing this as I'd never queue stuff from an user that has been online only less than 10% during last week [specially if he/she doens't have open slots and so there is also to wait in line]. Would it be possible? Cheers, Fitz