It hurts the servers to give everyone more item space.
You can give more server upgrades but it really needs also streamlining of code. And even after all that, eventually you'll just hit another hardware capacity as STO grows larger.
In other words, stop hoarding. My bank is full of unique items and some lockboxes, but nothing else, and I still have 8 slots out of the standard number empty, with my standard-sized inventory is almost completely vacant.
I do this by using my boffs and ships as additional storage space for gear.
realy great idea, will love it, just make it completly new tab (you will simply chose between investory/asset/stash (or how to call it).
You will have here just one line fos stuff - if you will more, you simply need to buy it .
I hope they will implement it. And if not, spam until they do .