ooooo now that opens up all kinds of possibilities ...
Well yeah, I think it'd be unfair to the P-51H, just sayin.  The F8F, on the other hand, was strapped to a carrier deck en route when the surrender was signed. 
I don't know about the F7F. 
Now as to do we *need* the P51H?  No, not really, it shouldn't be on the neccesary list at all, but if we ever get to a point where it looks like a viable addition that adds something in terms of gameplay (runnin down a tempest sounds like fun!), I think it'd merit an invitation.  It was there, the guns were loaded, pilots looking for toruble.  That's in combat to me.