When my last mouse became unreliable and i didn't learn to solder i attempted to adapt to an entirely keyboard based playstyle which lead me to discover mods like this: 6 months later i've learned to solder in new switches and have adapted to a heavily keyboard based playstyle with redundant buttons for mouse functions.

I have 3 keybinds for the attack/mine function, 2 for the left button and forward side button, and 1 on the keyboard bound with ctrl + w, every time i restart Minecraft i have to rebind that key in order to mine, i discovered a quirk where if i held the keybind, let go of the modifier and then the key it modifies, it allows me to toggle mine so that i don't have to hold down any keys and i don't know of any mods dedicated to adding this toggle behavior for mouse functions.
I also have 3 keybinds for my place/use function, 2 for the right button and backward side button, and 1 on the keyboard bound with ctrl + v, i also have to rebind this keybind everytime Minecraft is restarted so that i use items consistently and can toggle use/place.

Another example is my inventory, i considered binding it to 2 redundant buttons however i had to keep those buttons unbound before restarting Minecraft in order for them to reset, i had to restart 3 times to figure this out.

Please add the toggle behavior i've experienced with the modifier + key for mouse functions as a feature.