Grenades are at least forbidden, but they could probably stand to be a higher availability, and probably should be more expensive too. I mean yeah, grenades are inherently superior to guns for killing people, but that's kind of accurate to reality, isn't it? If you really could throw a grenade and command it to explode as soon as it got where you wanted it to go, whoever you threw it at would be totally screwed.
But that doesn't mean armies would suddenly replace all their soldier's guns with grenade launchers. Grenades are not used that often, nor should they be. As the GM, I'd make grenades tossed at my players pretty rare, limited to situations where they royally pissed someone off, and they aren't standing near anything that the opposition cares about. And if my players went around with bandoleers of grenades and grenade launchers and such, they are going to very rapidly become high Notoriety, high Public Awareness mad bomber menaces to society.
It's also worth noting that turning Wireless on or off is a free action, as is the command to detonate, so you can't do both on the same action phase.
Yes you can:
Free action to turn on wireless
simple action to throw
free action as simple to detonate.
You also have to ready the grenade as a Simple Action before you can throw it. No matter what, you are going to end your turn with a grenade in your hand, possibly armed, or on target and unexploded, giving the other side time to either try to hack it, shoot you in the face, or start running.