Full guide to come, but this should keep you satisfied for now

:
togglephase - switch between combat phase / build phase
addtime (seconds) - add specified number of seconds to current phase
(these two require sv_cheats 1)
sf_team_blocklimit - max blocks per team
sf_roundlimit - server will change levels after this number of combat phases
sf_scorelimit - server will change levels when a team scores this many points (N.B. a flag cap is 100pts)
sf_build_long_length - first build phase length
sf_build_short_length - other build phase lengths
sf_combat_length - combat phase length
(these are all in seconds)
sf_team_autoassign - force players to join smallest / losing team on connect