This VASSAL possesses a 1d10 die roller which now uses the Mersene Twister algorithm (now standard in the Vassal Engine). Typically the inherent die rollers are used for server play or where players are playing known opponents who they can trust. It is possible to 'cheat' by restarting a log file to generate a different set of die rolls and results. However such player should not be playing competitively in the first place.
Tournament play pits a lot of unknown opponents, new gamers, and players
from the computer game environment (reverting to save, anything is legal
vs AI opponents is the accepted norm). Additionally awards and titles may
be at stake. In this setting, use of an internet die roller is recommended.
These give the additional benefit of not needed to suspect extreme die roll
results. One neither has to feel guilty about great die rolls or be wary
of bad ones.
Internet die rollers come in three flavors, those customized to other game titles are not listed below. My personal recommendation is to use the inherent roller for informal games for PBEM speed and.or server play due to to speed; else the ACTS server for more formal tournament play.