Some of these suggestions involve ordinance that hasn't been modded yet, so this doubles as a suggestion for new weapon types.
IL-10More bomb and rocket combinationsCurrently, there's an annoying lack of variety in the IL-10's loadout selection. For example: we can't choose to equip incendiary rockets and bombs at the same time. It would be nice if this was fleshed out.
FM-2 Wildcat250-pound bombsFrom what I've read, the FM series of the Wildcat was designed to carry heavier bomb loads as an anti-submarine escort, yet for whatever reason, this option isn't available.
RocketsAnother possible loadout from what I've read, yet again, not there.
B-29 SuperfortressVB-6 FelixA 1,000-pound infrared self-guided bomb tested by the USAAF. The war ended before it could be used in combat, but in a 1946 scenario, it could be a powerful weapon.
B-24 LiberatorVB-6 FelixSame as B-29.
B-36 PeacemakerRazon BombsPrimarily for the WAW inclusion of the B-36. Razons seem fitting for the B-36 if it's shoehorned into a 1946 or 1947 scenario.
VB-6 FelixSame as B-29.
P1Y1 GingaDownward-firing 20mm cannonsA funky ground attack loadout consisting of 20 downward-firing 20mm cannons, apparently meant for use against B-29 airbases. A desperate tactic, but not as impractical as the G10N machine gun setup mentioned below...
G10N FugakuKe-GoThe Japanese equivalent of the VB-6. This was also an infrared-guided bomb that saw testing in 1945. The first versions proved inaccurate, so improved versions were manufactured, but never saw testing before the war ended. However, we don't shy away from new possibilities for 1946 scenarios, do we?
Downward-firing MGsA concept conceived out of pure desperation, this would turn the G10N into a ridiculously impractical gunship, the bomb bays filled with 40 downward-firing machine guns for brutal strafing runs.
Tu-2SDownward-firing PPSh-41 SMGsA ground attack experiment by the Soviets that may have inspired the Ginga and Fugaku gunship concepts. A Tu-2 was fitted with 88 PPSh-41 submachine guns in the bomb bay, angled down at 30 degrees.