Auto Select
Auto Select is a very useful feature in Terraria. Enabled by holding the Shift button by default, the correct tool for the task will be chosen, depending on whether the player is trying to mine stone with their pickaxe, cut wood with their axe, or place torches on a background wall. This is very appreciated and makes Terraria a lot more fun!
The suggestion, which aims to expand on the Auto Select Feature:
Adding Auto Select functionality to the Bug Net.
By holding Shift and hovering the mouse cursor over a critter, such as a bunny, bird, worm or a squirrel, the Bug Net will be automatically selected. The player is now able to catch critters comfortably without having to manually select the Bug Net.
I think this feature would be very useful to the player and would smoothen the gameplay experience even further!