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Hi trabis,
I think you can create new field named "bots" and put value accourding to bot type ( 0 = not bot, 1 = google, 2 = yahoo, ... etc )then make bots admin page whitch allow you to search for any ip ( even after update via csv file ) and select from drop menu the type of bot ( google, yahoo, msn, .. etc ).
I think mrphilong asking about hide some users if they belong to special group, I think this can done by adding new option for hide some group or add it to user panel to select if he/she want to hide his/her name from the list.