I was checking around the game. Blew my mind, nostalgia all day long.
Anyways.
While I was using Sydney's P. Ion Cannon I found that, after a shot, if you change weapons and change back to the Ion Cannon it automatically cools down, no need for the in between shots animation, it just fires away. I emptied the entire clip in 4 seconds, almost the time you need to only fire one shot.
Just a heads up.
If I didn't specify myself enough tell me and I'll try again =P
( Edit.- I didn't try this on any other weapon except the P. Ion Cannon. )
Thanks, see you guys in the servers.
-Zaph