Not sure what state the systems surrounding tool selection and use are in with the internal build, but if it's anything like the prod build it should be reconsidered.
The switching of tools is very cumbersome. If Im mining as a shaman and want to switch to the shield-heal beam, i have to press my switch tool key a few times, wait...i overshot it. dang...ok, got it....dang, my team-mate died.
Some more keys to manage this with would be helpful, but we have button real-estate constraints imposed by a console-friendly control scheme.
So, why not make tools activate without your having to switch to them? In the previous example with the shaman, if sombody is wounded, you point your crosshair at them and hit your "general use" key. Your heal beam comes out and heals. You need to mine ore now? just point at a minable object and hit that same key again. Your mining laser activates without switching.