Public hack question

Is it possible to toggle the hack on/off in game?
If so..how?

i believe by pressing Delete

Yes you always can change the settings while in game or in lobby or almost everywhere.
Only press DELETE and then surf with your arrow keys to select which hack to change value and to change from ENEABLED to DISABLED or DISABLED to ENEABLED.
Did this help you? I hope it did.
If it did, thank me.