I've now confirmed that as of GOG version 3.0.7.398, none of the suggestions in the OP of this topic have yet been implemented. Note that as part of this, identical item stacking ("All items of an identical type (except equipment) should stack in inventory/trading menus") is still a problem - e.g. some shells with identical icons don't stack with each other.

Hopefully, future game updates will gradually implement the requested improvements.