No no, i think you don't understand my wish.
My wish for the 2nd selection button is, that I can select all my triggers to drop bombs, not only the one selection to the secondary fire button.
As an example: FW190 F, load 500kg bomb (center), 4x50kg (wings)
Now:
select sec. to 500, drop it, select sec. to 50s, drop
primary still on guns, no selection
wish:
select prim to 500, select sec. to 50s, use both fire buttons to drop bomb(s)
select both to guns and strafe my targets or dogfight
better explained now?