Idk if anyone has suggested things like this for the game but i thought why not a jet pack?  How about a mech that has a jump pack and two mining arms that can collect resources and carry more than one researchable item on it. Also and idea for a type of explosive that can change terrain by either creating huge holes in resource spots to collect all at once or say a charge that when you throw it on the ground will create a level surface within an area so you can lay out a nice and neat base. Then the last type of explosive would be like the build setting on the gun, you throw it and it creates a wall or bridge, something along those lines.