TL;DR
Allow the blueprint, book, deconstruction and upgrade planner tool items to be stored directly in the quickbar.What ?
Let the customisable tools (such as blueprints, deconstruction planners, upgrade planners, and any mods might add) be stored directly in the quickbar, rather than requiring them be placed in the players inventory.It should still be possible to place them in the inventory when explicitly desired, but otherwise they just stay in the quickbar. This should work for all the bars, they should be retained on MP death, inventory transfer, etc. If the quickbar configuration does become savable /transferable, then they are part of that configuration.
Why ?
Currently, if you create a blueprint or take one from the blueprint book, or any of the similar customisable tools, and try to place it in the quickbar, it looks like it worked. But then when you switch item, using Q, the inventory, or otherwise, it vanishes and you are left with an empty but filtered quickbar slot. If you made any customisations from the blank/empty tool, those are lost without warning.You have to actually place it in your inventory explicitly, if you die they are lost, if you inventory transfer they go (ctrl+left click an empty inventory slot with say a chest open), if quickbar settings do become transferable/savable then they won't transfer.
It is very rare to have a situation where they are actually wanted in inventory item form. Even more rare to put them somewhere other than the players own inventory.
