Could the A-20G add a simple W or B suffix (or E or Ext for External and I or Int for Internal suffix) or something like that in the weapon selection indicator to show whether the Wing or Bomb Bay bombs are selected?
I validated in the training arena that there is no distinction. Lack of that is confusing. Several times have made initial bomb runs without opening the bomb bay doors thinking the wing bombs would come off first, but they come off second after the internal bombs (just the opposite of what I thought).
And even if you try to select the wing bombs first, there is no indication to show whether wing bombs or bomb bay bombs are selected.
Yes, the simple solution, which I have done, is to open the bomb bay doors before any bomb run, but this seems unrealistic and unnecessary for wing bombs, particularly if bomb bay door drag is modelled (which I don't know).
Presumably this bomb location distinction also should apply to other aircraft that carry bombs both externally and internally.