Well, Florian has said in the past he has no interrest to work on MIPS support. Of course, if anyone is actively working on something, the team will support such an effort, which is one reason why Florian is interrested in Thumb support. The fact that it hasn't happened until now is mainly that Florian has tons of things to do on the compiler. I'd say it is a matter of communicating that you are really waiting for it.

For the PS2/MIPS, someone has to start the project, and the team will be happy to do some work to support such an effort.