Anyone else use a razor naga or corsair with the multiple buttons on the side with 1-12 or even a mouse in general for skill keybinds? for example i have Multishot on 2 and when i hold 2 on my mouse it won’t charge at all but it will show the skills charge levels going up but do nothing, seems to be the case for any charge skill. i’ve tried to change my settings in software to toggle, on button hold, nothing works 
is the game incapable of using mouse keybinds for certain skills
I haven’t had any issues with my Naga Hex, but then again my Naga Hex keys are technically bound to Numpad 1-6, so I wonder if the game treats them differently because of that. If your mouse keys pop up as something else it’s possible the game might have issues with it?
I use a naga and don’t have any problems charging skills.
I use a g600 and I can charge my multishot. Make sure not to have it “repeat” the key.