It would create the so called "snowball" effect....one people flames on another, and so it begins....it would be a HUGE pain in the as$ for mods and such....personally I dont trust ANYONE without a solid reputation here (we all know who those users are), and MUCH Less if they contact me via any other way than forum legitimately known account....people should be smarter....we are supposed to be the 'smart guys'...if you get scammed so easily, how are you going to handle a large amount of users complaining/asking/begging and etc?....thats my PoV...and I really dont think this is a good idea....
Anyways the multiaccount thingy I do support...but not to get them into same usergroup but to display something like "other accounts: (name of other account on same ip here) on the user info.