Indeed, flamethrowers, and especially heavy ones, can be very handy. Once you start hitting often enough, they can pretty reliably take out personal armor dudes and even cyberdiscs (although I like softening those up with a mortar shell, RPG shell or high explosive too!)
I was wondering if you had thought of tweaking the inventory to allow scabbards, Dioxine? Something like detaching one 2x1 side of the belt, making it 3x1 instead, but costing 6 TUs to draw from and 11 to put back to. It would make it sit right between the backpack and the belt in terms of TU costs, so the "quickdraw" of dagger or pistol remains, but it would allow you to have a sword somewhere else than in your backpack which would be very piratey.