Gee, we better disable screenshots too because people can take screenshots of your stuff and claim that it's theirs. You guys aren't thinking this through.
I think you are being very stubborn here and kinda condascending. This is clearly an issue for many people and you are calling your "customers" dumb stupid kids. Granted a lot of em are, but we aren't all 12. Screenshots don't mean jack, its the actual build that can be manipulated and loaded into someone elses server. For me its not a matter of someone claiming it as their own, its the fact that MY server would no longer be the place to see MY work.
Maybe this could all be on an option. If you guys don't care that builds are pinched and messed with, then leave saving on for clients. If, like me, you don't want it taking away, give us an option to disable client saving. It didn't use to be possible !! Just telling us to password the server or play in single player doesn't let people see your work now does it. My current build is also interactive so screenshots alone are not enough. Its to be experienced. A 5 part maze over 3 floors, its a good challenge and many people give up cos its too tough. My server was a popular place to come because of this maze, and now it won't be cos it'll be on a bunch of diff servers.
Also, think about this. You are promoting sharing of builds. Someone makes a cool tower, someone else makes a cool church and someone else makes a cool pixel art thing. Then every server you go into you see the same old stuff being shown off, slightly modded on each one with someone elses name slapped on it. Its not the direction to go i think. Different servers should be different and have unique cool stuff to look at.
I've seen 4 different servers with the same damn city in it now. Each one having 1 new building somewhere. Its getting dull server hopping now, cos everythings getting samey.
Listen to your customers Badspot. The customer is always right :)