I agree that would be a nice option.
For now, there is a partial workaround.
Start a new game, make a custom character, and then on the employee management tab, export that character. Do this for any characters you want to create. Then start another new game, and import all those characters. They will become available for hire. They keep their stats and will be priced accordingly---so if you import a high-level character, you probably can't afford them!
I think currently you can only customize humans, felines, and catgirl/boys this way though, since those are the races available at the start. But at least you could have an all-catgirl resort or something like that.