I know that only the speedrunning mod is allowed but I didn't see anything related to a dlc unlocker. To me it seems that a dlc unlocker would be in a grey area since most (and often times better) equipment and perk decks are locked behind a paywall. This makes it difficult for people who can't afford to buy all of the dlc to compete. Quite a few of the heists are dlc as well so it is impossible to attempt certain runs without spending more money. I can see a moral reason why it would be disallowed but strictly competitively speaking I don't see why it would be banned.