This process can easily boost your badge, Kill/Death ratio and helps you rank up fast. All you have to do is to create some dummy accounts (clones), and someone or even yourself controlling the PCs, then start to kill the dummy accounts till the end of the time. The mode most used in boosting is the Team Deathmatch, with one player against all other. Because the auto-kick system will kick idle players in two minutes, only small and medium maps can be used for this tactic. Respawning time must be set to 0 (Or in case of CF VN and CF Japan, clones must have 4-sec fast respawn item). As soon as the match start, boosting player simply rushes to the other side and kill all the clones with headshot (Save ammo and boost headshot required for badge too) until the match end. If boosting player has EXP plus items, he/she can gain a lot of EXP with ACE and last kill reward.
The most penalties that can be given is a rank rollback. In case of very high-ranking player, he/she could receive a temporary ban or even permanent ban.