I’m not sure why it’s not like this already, but I think we should be able to combine stacks of items.
For example Crude salvage kits come in stacks of 15, but if I have 2 stacks, one with 10 and another with 3 I can not combine them.
The same goes for harvesting tools. If I only have 5 mining picks equipped and I have 50 in my bags, I should be able to combine the 2 for a total of 55 equipped, but as it is now I can only switch it out and have 50 equipped and leave the 5 remaining in my inventory.