"Potential Issues/Exploits: None to be known."
How about creating a drug dealing person that can arrest people?
Creating classes that can do what they want? Like someone actually making a terrorist that can just RDM people? Not to mention that people would probably want custom starting weapons too and it could be easily abusable to stock up on those weapons then, even if you stop them from dropping and holstering then they still have a good weapon whenever they spawn.
It's honestly just pay to win and don't believe that people will buy it if it's limited potential. If you limit them, then they will somehow just end up making a class that's the same at what the guys already came up with.
I really dislike the idea. I can see how it would benefit with the money made from it, but I don't quite think "selling out" is the proper thing to do.