Fisher of mechs: a large pull system of netting - we have a few in universe terrors of the deep. Now use a mech to pull them in - and then try to trap a mech with them. More of a trap/piloting skill impact than damage maybe.
Net would be short-ranged if tossed by the Mech, though using a Thunderbolt munition might be possible. So short-ranged, but a hit means the enemy Mech gets piloting penalties to remain upright depending on how much you beat the TN by? Maybe a divisor, so beating the TN by 4 or 5 means a 3-pt penalty to enemy Piloting rolls (1 for meeting the TN, 1 for each 2 full pts of beating the TN)
Grounding suit: ESD is the enemy of civilian industries all over the place. Adding grounding suits (often with grounding straps) for civilians has been a solution, why not for an industrial mech doing electrically delicate work it wasn't intended for initially (also the mental image makes me giggle). No idea what to translate that into for mechs, maybe less em noise creation or partial protection from plasma ppc or stealth spoofing?
Mech gets a bonus vs Mech Tasers, at a cost in tonnage?
Crowbar: useful for breaking up walls and lifting heavy stones in the field. Also loads of information about them used in fights - I'd suggest they get a bonus for damage or crits under certain conditions.
Use the rules for a club, mace, or
Rock Cutter?
Knife: not a sword or blade or vibro blade all with all the bonuses, but maybe it does what the unit can't by itself. Normally you can't quickly shape trees iron beams or stone, but with the mech knife you can make log cabins reasonably, I beam into mech Punji sticks or stone into Caltrops.
Take a vibrosword, halve the mass and damage for that size of Mech, but give a bonus on the roll to change raw materials into finished goods? A proper sawmill/cutting frame/stoneshaping facility can do it faster, but sometimes you need the capability in the wild.
Wheelbarrow: early on, when we had no idea how someone salvaged mechs in this game world, we figured mechs either worked together to carry units back, they used drop ship armor placed the unit on top and the dragged it back or they built mech wheelbarrows (traditionally Asian style instead of European if possible). With these once you got the unit stuffed in it was easy to imagine a 20 finger bringing back assaults. However once they are legal the things carried bloom terrifyingly.
Wheeled vehicle, no engine, just structure and cargo capacity? Pick the max movement speed of the wheelbarrow, and make sure you have enough structure to handle that. Of course the question then becomes if it would be better to just use a flatbed truck or a
CargoMech.
- European wheelbarrow with the wheel in the front would split the cargo weight between the Mech and the wheel, so if a Mech could lift only 10 tons then the max mass of the loaded Wheelbarrow (wheelbarrow and cargo combined) would be 20 tons.
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Chinese Wheelbarrow has the wheel in the center so the load has to be carefully arranged to be symmetrical. Since most of the weight is resting on the central wheel then the load on the Mech is much lower, meaning the Mech can carry more weight (same Mech could carry 60-120 tons).
Steal toed boots - the clans develop maybe the best physical weapon. Talons - so maybe a big strong boot can mitigate that a bit. Call it 25% damage to kicks and maybe slightly lighter or aid piloting checks.
Extra tonnage in the legs, not sure if proportional to Mech tonnage to get the benefit, or flat benefit per ton (like Mech armor, but mean and Atlas can have BIG STOMPY BOOTS). Honestly I'd treat it as Patchwork Armor, using Hardened armor in the Legs.
Leaf blower - give it ammo of fine dust and you are had to see. Give it charged graphite and maybe you can commit a war crime.
Vehicle grenade launchers firing smoke or chemical rounds would be a good way to simulate this.
Jugs - it takes a huge amount of energy to make what is in the jog to spill on you, but get into physical range and not only a bonus for one hit damage, you get what was in the jug on the target.
Cargo tonnage and a Fluid Cannon could simulate this. Unless you are thinking Mech-scale
Bucket Brigade?
Lasso - myomer lasso that pulls, may take a bit of energy (heat). Tripping and restraining fears.
Similar to the Net above, but lower tonnage and needs more piloting skill?
Mech scale duct tape. Add the mech knife from above and you might have mech scale MacGyver. All those traps in the woods, sticky ammo, attaching ammo to physical weapons (AC 20 on you sword is just a one shot hatchet with fond memories).
This one I have no idea how to model.