I think some of you are forgetting there is an activation time to every skill. Yes you can have focus fire up 100% of the time, but you are stopping your shooting every few seconds to do so. Extending the duration means you would be doing more damage than you are now. Add a few more short term buffs and you start to see that there is a tradeoff intended here. Spend half your time activating skills and doing no damage, or don't activate your skills and do continuous damage.
Is it annoying? Yes, but its part of the balancing and part of the game. Every class has to deal with this on the ground, its just how it works. I just say get used to it, its not that difficult in my experience. I find it quite manageable.
Really the only thing I hate about the ground interface is constantly having to press 1, especially if I want to use a compression pistol. It would be so much nicer if it was a maintain like in Champions, so you can let go of 1 when you want to use the secondary or melee or whatever, but otherwise you can shoot continuously.