I would imagine its something where its not just simply a boost in the air but more of a controlled jet turbine that increases and decreases the amount of propulsion they need, probably through a link into their power armour. It's sort of like the jet pack in Warhawk, you can stay and move in the air but also get a temporary boost in speed in a certain direction.
My advice to you is to get married, if you have a good wife you'll be happy; if you get a bad one you'll become a philosopher.
In the grim darkness of the future the economy has even hit daemons, The Changeling is working at White Castle and Skarbrand is giving head in the alley next to Fateweaver's.You ever receive fellatio from a rhyming demon? It's a bad scene man.
Sticking your junk into a fang-filled mouth that breathes fire doesn't strike me as particularly smart.
Which is why that option should be available to any willing to take it.
In fact, there should be fang-faced, firebreathing demons on every streetcorner offering to pay 100 dollars to give BJ's. The gene pool would be vastly better off without anyone incapable of thinking it through.