[Grand_Micha]

If you add that line to your script, every yellow marker (CJ's house, Cluckin' Bell, Well-Stacked Pizza joints etc.) will disappear and you will have to script your own pick-ups.
The checkpoint in the AmmuNation can be removed. I did it once, but I forgot how. I suggest you fiddle with SetPlayerVirtualWorld and SetPlayerInterior, then you'll get it.