Well, it would be just a bit impractical to use something other than the mouse for that, don't you think?
Do you have this repeated clicking problem with other applications, or only within Ace of Spades? If you have the same problem outside of the game there's probably something wrong with your mouse drivers or the mouse itself, so in this case you should update your drivers or get a new mouse if that doesn't work. But that's only if the problem doesn't just happen in AoS. If it's an issue specific to the game, maybe a reinstall is in order.

Anyway, to answer your question simply, there's currently no way to remap the controls.

Hi, I've been having a lot of problems with my mouse. Every time I right-click it starts left clicking constantly without me doing anything, so whenever I aim, I start shooting constantly. I was wondering if it is possible for me to change the controls somehow so I woulden't have to use the mouse to aim and shoot.