Wait for bayonettes, it might help.
Otherwise, it just seems that you (like many others in a certain regard) just want to play ETQW with Brink skin over it. Please accept the fact that it is a different game with different mechanics, on a different scale, and aggregating platforms. Going from WolfET to ETQW, at first I was shocked that I could not shoot my weapon while disguised. Then I learned to backstab etc. In Brink, it’s the same. Forget backstab : it’s gone. Use it for what it is meant to : just reach the enemy’s back line without being spotted too easily, and then begin the sapping work : spotting, hacking, capturing CPs, laying spikes in rush areas, and spot isolated to knockdown + kill them and comhack… it’s just different activities.