As far was low lvl alts ninja'n tara loot. I'd almost go as far as having 1 low lvl alt mandatory for Omni/Clan teams. Have this low lvl teamed with some 150+ char. If you spot an oppossing alt sneaking in to ninja, have this alt attack that alt, thus opening the prospective ninja up to attack from the 150+. Did it once in the past and worked fine. 9 times out of 10, the ninja alt is from the oppossing faction. As far as crowd control, there should be one person assinged to training mobs on low lvl atls sneaking in, unaccounted for.
Training and Teaming, possible exploits, but something clearly needs to be done to these ninjas who are in a way exploiting themselves.
z