Make more things default, things like the duplorcator and the fillcan.
Either make my own version that works best with Blockland or just coping it.
Also remove a lot of restrictions, like the brick limit, vehicle limit, lights limit, renaming players, opening restricted functions, ...
As long as they need to pay in order to play the game they can do what they want.
If they want to forget up their game by installing useless high demanding addons that may break then so be it.
Last thing would be making a decent terrain generator that uses ModTerrain and uses as minimal bricks as possible.
This would mean floating bricks that connect flawlessly while using the biggest bricks possible.
Maybe even make it so when you delete a terrain brick, it would create bricks arround so you never see a hole. Like in that mining gamemode.