Toddler high chair mods?

Yes it is so annoying. Not just with the highchair. But toddlers just seem to run their parents. What they want, they get. Even when they make messes all over the house. And i have the parent yell at them not to make a mess constantly. They still do it. There has got to be a better way to discipline the toddlers. They are not supposed to be the bratty lil boss. The parent is supposed to be the boss. So i just came up with my own form of punishment for them when they are being little brats. I lock them outside the fence of my house and make it rain on them and also make them pee themselves til they are all dirty and want baths. It is the only way that changes their lil attitudes from angry to sad and miserable. Lesson learned. When i let them back inside and clean them up. They seem alot better for at least awhile. I also made a timeout room. Where all they have is a chair. And only one parent can let them out when i allow it. That seems to work for awhile also. I lock everyone out but the one parent. But if the toddler keeps calling for them to be let out of the room. Then i won't even allow the parent who punished them in the room. It seems to work for awhile at least. But yeah. They just need to be able to be properly punished. It does make them learn that attitudes won't get them anywhere. I like playing the toddlers. But it irritates me that you can't really discipline them. Or make them stay in a highchair until you are damn ready to let them out. But the less mess mod is great. For the toddlers. Not for the tweens. They still constantly make messes reguardless of the less mess mod. So i usually just lock them out of my house until i'm ready to age them up to teens. Sorry. But the mess making really drives me nuts. So tweens live outside til i age them to teens.