So how about an additional ability for support super weapons?
The chrono sphere will additionally provide its user with a "Phase Lock" support power.
This support power, when used on structures and/or units, will put them in a state similar to being erased by a chrono legionnaire, however they will not become entirely erased; they will just stay incapacitated and invincible for 10 seconds. This may be used defensively or offensively: One could phase-lock an opponents nuclear reactor to temporarily turn off their power for an attack, or they could use it against their own things to protect them. The only thing that can attack something that's been phase-locked would be a chrono legionnaire, so if you have about 10 of 'em this is really useful.
The iron curtain device will not be given a new support power, however there will be a change to the iron guard.
The iron guard will now make structures invincible allowing their presence to be even more defensive.
The rage inducer will additionally provide a "Enrage Reactors" support power.
This support power will cause the players bio reactors to boil within, making a bubbling noises. When the bio reactors are in this state, your defences receive additional fire power and the base receives 50% more power. This support power works much like a firestorm generator so it may be activated or deactivated accordingly when fully charged. It lasts 2 minutes.
The blast furnace... um, well, the blast trenches would become extremely durability so that they could not be easily destroyed when inactive. They could also be built much faster, and remain active 50% longer.