Much as I don't agree with Dick's suggestions here, but with appropriate training, you will be able to use the same standards that Procedural Towers use, apart from visual separation by the controller - vertical, lat sep, clearance limits. This will be more restrictive than pilots arranging their own sep as in Class G.
Lat Sep will become more difficult as NDBs/VORs are turned off around the country, RNAV tolerances are so much bigger, apart from RNP.