Hey
I hosted my own server for around 14 hours which really opened my eyes as I found some things that maybe could make the multiplayer experience better.
Different types of color in the chat for different groups (For example admins have a specific color / you can choose ur own color choice per group) - Game already supports multi-color text
Extra tab / Info on who built what coaster (An extra tab where you can see who built that specific coaster/item) - Easier to find greifers too
Admins can choose which scenariers to disable (Easier to fight off greifers)
Being able to TURN OFF the "Spam random stuff around this area" (Often used by greifers to mass spam scenery)
Anti-Spam protection (A small delay when spamming too many items or a warning maybe? like after 4 items within 1 sec you have to wait 1 sec)
'Message of the day' - A pop up message when you join the server, the game already supports the campaign window + the "Network de-sync" (Good for rules etc)
Permissions to edit coasters + shops (Give specific people permissions to edit the coaster you're building on) - NEW: 2016-02-29
Remembering players groups (Good to ban greifers etc, just if it made a text dokument on the servers PC to save the statuses for players) - NEW: 2016-02-29
Dedicated program to create servers (Good if you want to host servers and not play it) - NEW: 2016-02-29
Voting system on coaster (Let people give a like or voting on a coaster) - NEW 2016-03-03