[quote=@Bishop]
Also, if someone is banned many times enough from different rps, after a number is reached you could red flag that person by giving his name a red flag badge so other people know who they're dealing with when said person shows interest.
[/quote]

That can both have a positive and negative impact on people and the community. You have to remember that an individual's ban from an rp is up to the GM's discretion, not a clear reflection on the member as a whole. There could be a number of reasons why the person was blocked that doesn't involve being aggressive towards the GM or RP (eg: blocked because of a lack of activity, or the GM doesn't like their writing skill/style) 

Presenting a public red flag on a member based on how many blocks they have is something that could be very unfair and exploitable, all while bordering on the line of harassment and bullying. If at that point there is a member that is creating multiple problems then it is something that the public should not take into their own hands to control. The last thing we want is for a member to feel targeted, to feel unwelcome because of a few mishaps and thread blocks.