The Domino, the scavenged Fire Control system, and the Self Defense Net all seem to indicate to me that it's possible to accessorize mecha surprisingly well in the setting. While much of this will be supplied for in the mecha Computer system in GH2, I was wondering if tune-ups might be a part of this power creep as well.
I suppose, really, that sensor systems, targetting computers, and overchargers are really quite the same as mecha "cyberware." Perhaps these could be offered as a "one time thing," a reward for a quest?
"Say, thank you so much for saving my daughter! It looks to me like you've got a mighty fine machine there; I need to visit her in the hospital, but you bring that mech back later and I'll fix you up with something good."
"Ah, you're back! She's doin' fine, thanks. So I've got a few devices here, managed to cobble them together when I was building that robot. My robot building days are through, y'see, ever since you had to put Mickey down, but these left-over parts are perfect for mecha. I owe you one. What would you like?
a) More speed
b) Better self-defense
c) A Class 10 ECM
d) The biggest weapon you can install"
To sum up, I've put forth two ideas. Purchasable upgrades analogous to the Stealth System and Self Defense Net, and a reward-granting quest which installs something analogous, admittedly in Fallout style. Although I could hardly demand such things, I'd like them to be considered and would also enjoy a discussion of their feasibility in coding.