Quick suggestions for both! Less wordiness, more content.
Melee weapons
1. Primary attack for vertical swings: Standard strength OR stronger hits, but limited to hitting one enemy at a time. If you're lucky, you'll hit two crawlers if one happened to jump on another.
2. Secondary fire for horizontal swipes: Weaker than the vertical/primary attacks from a lack of gravity lending to the force of the swing, but capable of hitting multiple enemies in a 90 degree angle or so in front of you. Range is limited to the weapon itself, so this wouldn't help as much for the knife compared to the axe.
Chainsaw wouldn't need these since it already has something akin to these on its own.
Flashlight
1. The ability to use a flashlight for one-handed weapons. Specifically... Knife, Machete/Pipe, possibly Handcannon. Only being able to use the default pistol or shotgun in dark areas for light is a tad annoying. Not game-breaking, but the left hand should be used for something.
2. Purchasable helmet light... Thingamajig. Usable with any weapon, but makes you more of a target for enemies because of the whole head beacon thing.
Melee weapons
1. Primary attack for vertical swings: Standard strength OR stronger hits, but limited to hitting one enemy at a time. If you're lucky, you'll hit two crawlers if one happened to jump on another.
2. Secondary fire for horizontal swipes: Weaker than the vertical/primary attacks from a lack of gravity lending to the force of the swing, but capable of hitting multiple enemies in a 90 degree angle or so in front of you. Range is limited to the weapon itself, so this wouldn't help as much for the knife compared to the axe.
Chainsaw wouldn't need these since it already has something akin to these on its own.
Flashlight
1. The ability to use a flashlight for one-handed weapons. Specifically... Knife, Machete/Pipe, possibly Handcannon. Only being able to use the default pistol or shotgun in dark areas for light is a tad annoying. Not game-breaking, but the left hand should be used for something.
2. Purchasable helmet light... Thingamajig. Usable with any weapon, but makes you more of a target for enemies because of the whole head beacon thing.