This suggestion is about adding a hotkey option in the options menu for ingame.
The hotkeys can be set with in the Key binding options ingame.
These hotkeys are for the shop menu for quick buying
Open the options menu
Click Keybind option
Set Keybind shopmenu 1
Set item shopmenu 1 as Frozen mallet
The thing that might take the most coding would be is if you don't have enough to purchuse the full branch for Frozen mallet then it buys what you can from the branch of it until the item is bought
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