You may recall they do plan to implement a perk price for specific loadout options.
The F4U-1C, for example, is intended to be a perked guns option for the F4U-1D plane in the hangar list. They just haven't got to that point yet.
I doubt you'll ever see remote control bombs, but perhaps the more powerful loadout options like 4x20mm on a corsair, or perhaps the TseTse gun for the mosquito, or the BK5 for the Me410, or maybe (I'm just brainstorming here) big bomb options like the 4k cookie on the mossie, stuka, lanc, etc?