In cutter's cry after 1st boss u can just race to the 2nd boss ^^
Just tap the portal and sprint on and on, lots of fun lol
After 2nd boss u can just run all the way to boss and revive tank that pulled everything( sac and pull) thus skipping all the mobs.
Hence y se made newer dungeons have lots of barriers.

And yes dps when you want, i'm pretty sure tht most ppl u run into won't question u about dpsing as ur healer isn't running around in i100+ gear with a i110-i135 wep. They'll just be like any dps from healer is like the cherry on top.