Honestly they should just combine callsign orders and appearance order, because we get waaayy to much of the former and waaaayy to few of the later.
I also totally agree on being able to sell currently unsellable weapons as you mentioned.
Especially for the people who were around during the random weapon drop for a bronze order, which create a situation where some of us have just a ridiculous amount of things like mortars or PIATs…
I would also like to be able to transfer stuff that are currently not transferable like handguns, ammo pouch, explosives, mines, etc.
(In the limit imposed to current transferable weapons of course, but with a lowered price or at least having to transfer them in batch, just not having to transfer one thing to the same level)