Say i have 10 or 2 types of cargo in a station, A and B, but only 4 cargo slots.

I want to take 2 of each to a sector to see which sells best, but i can only load 4 of 1 type with teh way it is now.

We need a way to load only a certain # of cargos.

yep

and a way to unload just 1 of a type, it'll come eventually.

and to refit all weapons with ammunition.
(i do believe this is the right place to say that...)
and...
you can already unload only one specific type of cargo

I said one of a type, not all of one type.

whoops.