You might be able to buy another pen. I know wacom sold different pens. The buttons on the pen that came with the tablet I had was ok, but a bit loose if anything.
I think I kept hold of the pen while typing, but that depends entirely on how you type. I only tend to use my forefingers & thumbs these days for typing. Eagle claw method.
I tried using pen mode as mouse & that didn't work very well at all because the mouse cursor jumps around the screen & the tablet surface area wasn't very large so it made it hard to correctly guess where I'd need to move the pen to for quick selections & so on without hovering.