The leagueQueue in ConfigureMatchmaker() (qid 502) runs universe-arena battles in mode 3 (capture the base) on 10 maps, 12 players max, no bots, wings of 3+ (min team 1). The map list is the easiest multi-map pool to extend. 

local leagueQueue = {
  maxPlayers = 12,
  regionLocalizedTimeInQueue = 1,
  special = { universe = 1, minSizeWing = 3, minSizeTeam = 1, withBots = false, botPresetByTier = {"BotsBZS_T3","BotsBZS_T3","BotsBZS_T3","BotsBZS_T4","BotsBZS_T5"}, queueFlags = { universe = 1, rank = 15, }, },
  squadFilter = 0,
  qid = 502,
  levelsDesc = {
    s8256_thar_barrierdebris = {3},
    s1338_devilsjaw = {3},
    s1338_pandora_dreadnwreck = {3},
    s1340_thar_aliendebris13 = {3},
    s1340_thar_gasgiant = {3},
    s1420_ceres3_asteroidcity = {3},
    s1338_pandora_anomaly = {3},
    s8256_thar_concourse = {3},
    s8256_thar_lavastone = {3},
    desttown = {3}
  },
  query = { ["mmParams.universe"] = 1, ["mmParams.universe_arena"] = 1},
}
Add any proven PvP map as name = {3}. Banned gear comes from leagueForbiddenDefs, not here. Set withBots = true if leagues should fill with bots when empty.
Additional Notes: 

qid 502. All entries use mode 3.

Comments

1 + 8 =
Solve this simple math problem and enter the result. E.g. for 1+3, enter 4.