Could you please give an example of a time where you would need to lets say, give someone access to certain button, and not another? Why would you not simply allow them to your lot if you're ok with them using your contraptions.
Sorry but I can't come up with a time where this would be needed.
Let's say you want to allow people through a piston door into a part of your lot, but you don't want them to access your potion room. Or you want to make a food dispenser for people who suffer from hunger, but don't want them using your light switches.
Are you suggesting making ALL inputs owned objects? This was once thought about but decided against.. However you could have a sublot made and have the LockInput flag set or removed on that in order to control what individual inputs can be used!
Not all inputs, but you could set the LockInputFlag and allow people or the general public to certain Inputs. Kinda like being able to lock certain chests with signs, but not accounting for all of the chests.
Like egg said, making a ton of mini sublots would be impractical unless the lot owner could make the sublots themselves.