It allows moving much more items within Spidertron using Q.
You put items in, then Q, then fly rocket to other planet and there recall spider taking back all items that you put in.

Suggestion how to fix that:
- Bind spidertron inventory to surface - this way one CAN take spidertron (and it's grid and ammo) but not it's inventory
- Add a research to be able to keep inventory but make it very endgame ("Spidertron Quantum Inventory" or alike)
- Add an option that locks that to settings, so player which prefer keeping inventory (as is) could do so...