This reminds me of Quake with the DeFrag mode "sub-game", but also gameplay available in Quake Live in which you could have a Railgun only match, but they could also behave like Rocket Launchers for rocket jumps.
Also allowing players to change the configuration of their game through the dev console was cool. My favorite visual change was to configure the railgun trails to persist for multiple seconds.
We modified Action Quake II (somehow, I forget how) to change gravity (I think it was in the map itself) and we would bounce around Cheyenne in a completely different playstyle - and everything would send you flying.
Railgun trail to match the reload time, always!
> also gameplay available in Quake Live in which you could have a Railgun only match, but they could also behave like Rocket Launchers for rocket jumps
That used to be my jam in Q3A, Instaunlagged. Nothing is quite like railgun jumping with no splash damage. Dusk's crossbow jumping comes close, but isn't hitscan..