For aiming there should me a button to aim rather then left mouse button because I’m on laptop and you can only press one side of the trackpad without pushing the other finger off messing up either your aim or preventing you from firing
I would simply suggest you to get the cheapest mouse you can find, it will be 100x better than what you’re suggesting and gaming aside, just going to improve your overall use of that computer.
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Go into settings and make aiming toggle instead of hold
Maybe bind to another button?