I like teaming with engies for their Reflect Shields, AC buffs, Shield Debuffs, AE blinds, MA Uber Skill, Distracting Bots, Pistol Buffs, and (soon. it's on test) AE grenade damage.
I don't think most people have realized the benefits that a smart engie brings to the table for mass battles yet.
Same goes for Crats with their AE roots, NR buff Auras, Nukes, Att/Def Auras, NR debuff aura, etc. You guys will be in high demand (by squads i'm fighting with at least) any time there is a large scale battle (Booster Pack!)
I LOVE Engies and Crats!
From what i understand the Beacon Warp thing is only temporary.
I hope the ultimate solution involves an entry lock by FACTION. ie 40 omnis can walk in but at 40 only other faction members can get in (the number is an example only)
<edit> this isn't the right place , but grapevine says that engies get pet root breaker nanos soon