Decoy Grenade - Emits gunfire sounds; blips on hostile TacNet.
Miasma Grenade - No idea what it'd do, but I want one.

I've always wondered what happened to other conventional means of warfare, like smoke, and flashbangs. I understand that a flash grenade is highly unlikely to have any real effect on a genetically modified super-clone in power armor, but surely there should still be some smoke.

Decoy grenades would work better as a projected arrow (You know, the one that shows up above the head of a detected enemy) that shows up on the radar and visually within a certain range. This is should rely on your dropsuit's scan profile, that way it limits the abuse of such an item though.

I'm not so sure about sensors, since you have passive suit sensors and active scanners.

The Hive grenade is also something that already exists, technically, the compact nanohive may not be a grenade but it repairs and restocks. Which makes turning it into a grenade kind of pointless.

The barrier is viable though, and will solve problems when stuck in open fields when a firefight breaks out. Perhaps a semi-circle with a decent amount of shielding.

The miasma variant... It sounds cool, but how do you use poisonous gases on power suits that have air filtration built in? It even says that they have them in the suit description...

Hmm, between acidic gas and destructive nanites, I'll take the nanites.