I don't know if someone has mentioned this yet, but during the journeys end trailer if you pause it at the right time you can find out the name of the spear used in the underground desert biome. In order to do this you have to go to chippygaming's journeys end trailer breakdown video and pause...
I support for the most part, although I'm not a huge fan of the damage drop off from putting the staff away. And if you can control where your minions go wouldn't that just turn all summoning weapons into items similar to the rainbow rod?
For me it's the opposite, after I defeated the mechanical bosses I only got solar eclipses I didn't get a single blood moon. Terraria really needs to fix their spawn rates so you can experience each event a relatively equal amount of times.
I suggested this mechanic so you wouldn't need to constantly manage your inventory. And remember you don't have to use This feature, its for whoever wants it. This is supposed to simplify looting not complicate it.