I frequently change salvo setting in the middle of an attack with P47.
For example, to pork ords and radar will set salvo 1 for bombs then change to salvo 3 for rockets.
If taking out a hanger will set salvo 6, then during dive fire rockets 1st, then bombs since rockets can hit more accurately from farther out. Then switch to salvo 1 or 3 for remaining rockets depending if I want to de-ack or pork radar or ords.
I went back and read all of the manuals to get this straight.
The very last P47-N analog rocket director gave a choice of how you would salvo, 1, 2 or ALL. Then you kept track of your rockets fired. You had to keep track of how many you fired if you wanted to change from firing one at a time to two at a time. You had to set an analog counter to the number for the next rocket in line to be fired, then reselect from 1 to 2 fired at a time.
All pilots had to keep track of their ordinance. Hitech very kindly does it for us.
The analog director the P51D, P47D and P38L had installed, gave a choice of individual fire or salvo all. In all planes the bombs could be individually selected for a button release from the control stick\wheel or released all together.
The analog director individual fire, you either set the analog counter to 1, which would start off with rocket 1 alternating wings with each button press. Or, you could dial to any of the other rockets to start with as a single fire which would alternate from that point.
The F6f and F4u selected bomb drop by an arming switch, individually or all. Rockets were fired as selectable pairs one from each wing with pairs being selectable. The later F6f could fire an all salvo of rockets. F4u were restricted to firing in selectable pairs with each button press.
Hitech has given you so much since you can choose firing options that never existed and ignored the historic fixed options to make the process simple.