Guys:
Is there some way to add other planes to real-flight that they do not offer?, i want to add a Gee Bee R-1 or R-2 and a model Z before i get a real one and attempt to fly it, any help would be appreciated.

So far I have heard of no official downloads from greatplanes for new aircraft but I do believe some other owners of G2 take the original models from Realflight and modify their trim scheme and their characteristics to make it similar to the actual model. Try a search on google. Or check out realflight's homepage at http://www.realflight.com/ and click on the swaping page.

That GeeBee is gonna be a tough one but for more traditional planes there are two main sites:
The "Unofficial G2 swap page" or FUBAR Hill
http://zeus.rcwizard.com/fubar_hill/G2.htm

And of course the Great Planes swap page:
http://www.realflight.com/swap/