Nice idea! I know trickjumps work best with Frag maps not co-op because of the faster speed.
Not sure what a cronometer is.. google suggests something like a stopwatch? I dont think thats possible within the editor but you could use the level timer hud_bShowTime=1;
MAP UPDATE:
Progress is slow on the map. I am waiting for Serious Sam: Revolution to come out so I can get SEd to work with Win7 x64 without issues.
Dual booting is how I work on the map, but I want Serious Editor running on my main OS. I would definately make more progress that way.