That would really only be viable if it meant X amount of hours out of total play time for that week, otherwise players whom can't play that often would just be spamming the forums wanting cop back since they were out for a week and shit was stripped.

Honestly Cop just needs a Rework or some new stuff to do when there is no crime going on, can't make any money if not a soul is doing anything or constantly gaining crime.

Well when I add the NPC system, there will be NPCs walking around that could be arrested. They will also be some annoying motherfuckers that will try to kill you as well if you are a cop.

That'd be a good start or possibly end to it depending on $$$ gotten from them and if they give EXP or not. Also depends on how often they would spawn.

My main point is that no one plays cop really because it's not nearly as rewarding as playing Rebel. Sure you can spawn with guns but only at a Higher rank(for decent ones) and you can't just go blowing people away with them. - The cash per hour for the most part is 1/25th-50th(Made up but making a point) of a proper Rebel job.
As a Rebel during down hours you can atleast make decent cash whether a cop is online or not. - As a cop though there is no cash at all to be made if no ones doing anything.