Hey,
I haven't had much time to even finish off the last bits of v5.0, which actually does have a Gatling gun robot in it -the engineer droid. The engineer droid is a close-range gatling gun droid with an area-effect repair aura, and can also build any building blueprint you put near them if you have the required item in the engineer storage chests in your base.
Regarding the new robots, I do want a sniper robot, a long-range/mortar robot, and tank/grenade launcher style robot. I just don't have the time yet.
I do want a medium/large mega-bot for late game usage, to allow people to have less robots which do more damage and not need 1000's of normal, early-tech droids. This will help scale the end-game, and also reduce CPU load from the mod.
It needs some careful game-design, recipe/cost balancing, tech pathway planning, custom artwork (takes time/outsourcing), and for more advanced features (like auto-casting abilities such as automatic grenade-launching when enemies come within range every 30 seconds, etc) it required a bunch of testing and prototyping ideas and ways to efficiently code them into the game.
I just had a baby, so i'm on paternity leave soon, will have some time.. but also have 100 other projects and some with $ involved so I can't guarantee I will be able to make all these dreams come true for this mod.