I've just seen this thread by coincidence - if you don't know it exists, you can't look for it.
It's a great idea and very helpful - I've only made a handful of RP posts so far, but even for these I had trouble finding names for parts of architecture or ideas for costumes - wish I'd known of this thread then.
So, I think it should definitely be made a sticky!
Why don't you just e-mail one of the mods who works with the RP forums, they would understand how helpful this is.
Maybe your previous mail just got overlooked - you should have had a response of some sort in any case.
Doesn't cost anything to make a thread a sticky, so why not?