Here I'm gonna list my suggestions in bullet form for a short read format. To keep track and to recommend to BigBox. If you comment only do so in Bullet Point.
SANDBOX
*separate sky template from ground template so we can mix and match.
*add a horizon template to add to edge of map.
*max out map size
*add a lock feature to lock a pieces place so move can't grab it.
*add a duplicate feature like scale feature but instead of stretching it duplicates, and multiplies pieces and snaps them together.
*superman type rotation when you move a piece, same side facing you as you turn around and place piece.
*flags to capture and zones to deliver them to as interactive artifacts.
*one way forcefield you can walk through but not shoot through.
*lower budget trees, bushes, and more nature shapes.
Custom GAMEPLAY variables:
*allow the ability to change character load out in lobby of game.
*name tag toggle to turn off teammates tags.
*night mode toggle.
*new moon mode with stars in sky, no moonlight, and darker darkness.
*throw a can of soda for a 5hp headshot.