Machete - Make it THROWABLE (ironsight). Yomamassis made animations and all, here's that thread:
http://forums.tripwireinteractive.com/showthread.php?t=46393
Looks really sweet!
Dual Machetes - Yes, make it DUALWIELDABLE too. When dualwielded, ironsight is once again throwing it (or going into aiming mode). The second Machete is another 100 dosh.
Fire Axe - Make it THROWABLE, just like Machete. In addition, make the primary fire be able to cleave through 1 target (so you hit max 2 targets in total)
Katana - Make the secondary fire be able to cleave through 1 target (so you hit max 2 targets in total)
Claymore - Make the primary fire animations be all horizontal, and make its attack cleave through unlimited amount of specimen!
Make the secondary fire be a strong overhead attack, which deals enough damage to stun a Scrake even with a BODYSHOT as a level 5/6 Berserker! (That'd require raising its damage from 320 to 335)
Chainsaw - Make the primary fire do a liiiiittle bit more damage so you can instantly decap trash even on HoE.
Make the secondary fire have a higher headshot-multiplier (1.25x, up from 1.0x) so you can stun Scrakes with frontal headshots.
Also, i'd suggest giving it a fuelrequirement (only consumed by primary fire?). As compensation for the fuel nerf, i'd also let the Chainsaw count as a melee weapon (aka run faster with it), with at the very least a PARTIAL speed bonus.
All this might also require a new higher price on it, and a change of what weapons to spawn with as a Berserker (5 = Machete, 6 = Fire Axe?)