How about the option to buy robotic vendors and other staff? [yesnod]
This would resolve several things (vendors quiting in sandbox parks, etc) but add an interesting difference in gameplay: no more salary and happiness issues, now you have maintenence costs and mechanics (which can also be robotic) should do regular checks and come fix when there's a breakdown (like a ride). Entertainers would be substantially the same, but with robot feet (or whatever) showing beneath the costumes. Great for sci-fi parks, of course.
Since (aside from the artwork) the differences would primarily be removing behaviors from the existing staff setup, this would be low-to-moderately difficult for the dev's to implement.
This would resolve several things (vendors quiting in sandbox parks, etc) but add an interesting difference in gameplay: no more salary and happiness issues, now you have maintenence costs and mechanics (which can also be robotic) should do regular checks and come fix when there's a breakdown (like a ride). Entertainers would be substantially the same, but with robot feet (or whatever) showing beneath the costumes. Great for sci-fi parks, of course.
Since (aside from the artwork) the differences would primarily be removing behaviors from the existing staff setup, this would be low-to-moderately difficult for the dev's to implement.