Please add more slots to the glamour dresser

[Niwashi]

... or forcing me to manually apply a different glamour every time I equip it.

While I agree with everything else you said, if you want to apply a certain glamour every time you equip a particular set, you don't have to do it manually. You can assign a glamour plate to the set and it will automatically apply every time you equip that set while in town. (Unfortunately, it doesn't get around the annoying in-town-only rule.) Right click on a gear set to bring up the list of options for it, and one of them is for associating the set with a glamour plate.