There are some toggle based skills ingame.
But the problem is
1)They all have animation delay to activate
2) Not all players from NA = big delays, so it will take ages to switch weapon and activate toggle.
3) Low amount of spell slots and slow reaction on weapon switching. You should lose 2 slots to use one toggle to be honest....
So my suggestion is
Remember last state of toggle. So if you activate it on slot1 and switch on slot2 - effect will disappear, but right after you switched back - no "toggle activating animation" and toggle already activated like it was before you switch.
Atm toggle machanic is really annoying!