If I have nominal voltage of 1V and I want to glitch with 0.6V for a few ns. Can I adjust the crowbar MOSFET that it will not always short to the ground？
No, this isn’t something you can do. You’ll need to use some sort of external glitch setup for that. There’s more information in this thread: Variable voltage glitches - #2 by Alex_Dewar, as well as some discussion on this in our discord in the #voltage channel