I don't think it is entirely a myth, I have seen equally credible documentation by pilots that flew them in combat that support them as being wired shut.
Either way it is inconsequential. AH doesn't model hardly any of the technical problems these aircraft actually had beyond compressibility effects. So, I would like to see this little problem ignored as well for my own entertainment (myth or not).
Beyond the guns feed/jam problems due to the original sideways installation and the restricted visibility, Mustangs had major landing gear problems!!!
P-38s had so many problems (too many to list

), they replaced them with Mustangs

F-4U had so many problems, they gave them to the Marines. Of course the Marines did so well with them, the Navy asked for them back

The Bf109 was obviously a great plane in the hands of a skilled pilot, but most pilots couldn't even taxi or land without damaging or crashing it.
The F6Fs only real problem is that the F4U was better

If AH can neglect all these things for all these other aircraft, can they please give me an A-36 with functional diver brakes? I tried flying it in WB3, but I can't stand WB3 flight modeling and its graphics don't mix so well with the Voodoo.