editing tool modifier /select tool

It’s not exactly a key command but still it belongs to key command complex
For editing tool modifier /select tool
Alt is the key modifier for Split Event - this modifier is snap (on/off) dependent. Means when “snap on” is activated I can split the event only within my selected grid/snap type.
I would like to have an option being able to temporarely switch the grid off with an additional key command while pressing the Alt Button.
Practicly the same as for split tool with Ctrl but without having to switch to actual split tool and doing all this while select tool is selected.