The Hiding the intel problem (which is super cool!)
Currently it's possible to "hide" the intel by building new fake intel icons and I think that is a brilliant "feature" because it's "not designed" but a behaviour we, the players, have invented. However it becomes really difficult to spot the real intel when there are 20+ intel signs on the map. The map grid of course facilitate easier team communication about where the intel is but still I think the game could use a mechanic that helps detect if a map icon is fake. And this would be:

Orbital Laser.
The laser is operated from the base tent. To aim and fire you use the map. You use blocks you've "harvested" as ammo. The laser destroys the blocks it hits. This way it can be used to shoot at the fake map icons. Additionally it can be used to dig out larger areas but of course it is not accurate. When fired it should shoot a thin white line from above to tell that its charging and then expand the beam. It can of course move while its fireing so it can plow the landscape.

Reporting in enemies.
A button for reporting in enemies when you are aiming at them would be a really good mechanic. It will help communicating where the enemy is so you can call out their position for a period of time. This of course combines very well with the orbital laser (or other artillery) Imagine being chased by an orbital laser...

Remote controlled C4 charges
This has probably been suggested before, but a game with destructable terrain really really begs for remote controlled charges. The can be used for offense, defense and for construction.

...and a zombie mode would be cool, I still haven't seen a game with the same barricade building potential as Ace of Spades.