Board Thread:Modded Servers/@comment-26888709-20161231090700/@comment-26222246-20161231134533

I'm not sure if its 1.8 onwards (when command blocks were heavily improved) but theres a command block think you can do (I don't know how, google it) which makes it that if you enter a certain area you go into the chosen gamemode. Since I assume that you don't have any plug-ins and that this is not a bucket server this is possibly your only way of solving the problem.