How about this for a weapon suggestion. A vickers machine gun! This weapon would be special in that you would still carry a SMG, or another new weapon like a weak pistol, but instead of carrying blocks you have a vickers machine gun. This weapon has 400 rounds of ammo, high accuracy and a high rate of fire. BUT AT A COST! you can only use this weapon by right clicking a red block (or a random block which has the colour displayed at the top right of the screen). That way another player can place the red block for you. You can deploy the weapon and can fire but you are locked into a position (easy for snipers). You could still crouch but you can't fire while crouched and you cant move from your position.

Please comment below for any other suggestions!