Thermobarics at least should appeal to you, of all people... 
Of course! I wrote all the WMD rules, after all, but for my Syberians... well....
The prototype weapons could be cheap glitchy versions or used by factions who aren't quite as advanced to have full SLDF or 3060 IS Tech.
That's already allowed. Under the Prohibited Tech part of the construction rules:
"
Primitive Components: AutoMechs may not mount any primitive core components, such as engines, cockpits, gyros, and the like. Primitive and prototype weapons may be mounted on an AutoMech, however, reflecting flawed or low-resource technologies being produced in Syberia’s older manufacturing centers."
From TH, the Blazer and Glazed armor are good as prototypes of Reactive and Reflective Armors found in TO. Glazed Armor is even mentioned in TO, as is the Prototype Caseless Autocannon. AP Missiles are good against hoards of squishies. The Command Console is ideal for Primitive Command Mechs. I also like to use the Mechanical Jump Boosters as prototypes of the TO version.
If we're talking about the convertible AutoMechs, those armors would be disallowed anyway, as would be the Command Console in any AutoMech type (I'd have a primitive AutoMech brain simply being a heavier brain, with no added bells and whistles, OR an honest-to-Cat ATAC drone system...but having to deal with those command flowcharts would drive me buggy.) Don't have an opinion on the rest, though I would come out with strong caveats about those mechanical boosters if someone put them on a FighterMech and claimed those mechanical boosters generated aerospace thrust (because they don't).
With MT, I still like using the targeting systems as low tech, low cost, alternatives to quirks. I also like the bypass kits. The Critical Space Limits rule is interesting. (I'm thinking of them for IS Protos or Alien Mechs) There's the Additional Crewman Rule. (Found it!
) I like the Snow Mobile Chassis Mod. It's use would be rare but still useful. So are Hot Loaded Missiles.
Meh. But they're not really construction rules, and some of those rules might really handicap your AutoMechs, what with the lighter ones not really having a lot of space in them to begin with. A Snowmobile chassis mode being tossed in as a Quirk could be interesting, but it's worth noting that there's no snow on Syberia, so they'd be meant for one of the few worlds in their system where there is enough of an atmosphere for something *like* snow to happen.
So there's a few things in both these books that I think could have been included in TO or IO. For Syberians, some of these prototypes were introduced before the 3060 cut off date. They could be used on prototype drones. The bypass kits might be something Medical Drones might carry around to repair the wounded enough to get them to a repair bay.
Given that the Salvage Arm is fluffed as having multiple "powered tools" to aid in its work, bypass kits may be one of said tools, so there's that.
As much as I love Blazers, they weren't even prototyped until after the SLDF left... 
They fall into the category of "Inner Sphere pre-3060" though. How/Why the Syberians arrived at them is open to debate.

- Herb