Hey! I have an idea of making the server bigger!
Maybe add a few minigames like: Prison,Spleef Or Hide and Seek!
It will make the server even MORE fun!
I feel like the gamemodes you stated would make great server events. As you might know there are regular server wide events in which players can come and have a good time, and even win some cool perks.
olympus = prison; the old prison server was replaced with olympus and i really doubt it will be coming back. minigames such as spleef or hide and seek would be hosted on the events server if the staff team thinks that it would be a good idea.
Yeah, there are plenty of servers out there with minigames, Manacube is about the best versions of standard minecraft games, and robust well moderated communities. Minigames will just bring in the wrong kind of crowd.