Hey Doublecool,
I'm not sure about releasing any repaints myself, but I do know that one of Warbirdsim's goals is to arrange a method in which all of our customer's repaints will be available, in a centralized way, through Warbirdsim's web site.
A problem that faces me right now, is the update that is underway for the FSX P-51B/C product. The exterior has been under surgery, to the point that it will require slightly different texture layouts for the exterior, than are currently in place, both for higher resolution and corrected items. As this is the case, it would probably be a good thing if all repainters keep their layered files intact. Right now it looks like the update would be released sometime in late summer - it all depends on when the D is finished, and there will be a number of months following this to really get the update finished off - while still doing work to support it.