Setting the respawn time for a single cell?

[I have no name]

I've been told that most cells in this game never respawn, I never really return to places to check this but sure enough when I cleared out the enemies in my mod and waited outside for 3 days, the old oblivion time limit, I came back in and it was still empty. Someone told me their was a console command that will fix this, but the console doesnt work. I dont know if its Vista or the laptop but I've tried every idea on the internet to fix it and nothing. Is their anyway to change this in the GECK?

Edit: okay I figured out I shared an encounter zone with Fort Independence, so I set that to respawn in the GECK and set every enemy to that zone. I come back after 3 days and their all back, except the super mutants and their two behemoths. Is their something special I have to toggle for them? And as I type this I notice super mutants dont have persistent reference automatically checked. I have no idea what that is but might as well try it.