no to combining all the regs. each city has what it has. we have a city that only allows colored backgrounds on signs, no white. we have another that allows only halo lighted channel letters. another that only allows carved or sandblasted. just those three examples makes it pretty clear that there is no combining, you have to deal with each city's regs. maybe you don't live in a crazy place that has all that many regs and it might work, for me, there isn't a chance.
yes we have reps from our company sit in and are consult with city planners concerning regs. it helps some. they don't think in terms of business and the needs of business, only some strange warped sense of what will make their city "pretty". right now we are working with a city that wants to change their regs so that a business has to put their sign within so many feet of their curb cut. sounds reasonable but really isn't as there are areas in this city that has no curb cuts off the main road and they route people around to side streets so ther aren't so many people turning off the main road. with the sign around the corner, what good is it to a business or the person looking for that business?
it's always better to try to work with these planners, but unless your part of the world is different from mine, it is hell.