Yeah… but Sigil is a small area where Divine Toll you can snap aggro and interrupt mobs in a 25 yards area and do damage without using another sigil for that
EDIT: one redeemable feature for DH is the legendary which reduces sigils CD and quickening sigils talent.
The reason I haven’t done a 15 is because I don’t care to. The mount isn’t something I want, the gear upgrades from valor isn’t enough of an incentive.
What do you mean by “make boosting easier for a booster”?
For the other boosters or for you?
If your answer is for the other boosters, either a good tank class or a dps class with strong utility.
For tanks I recommend Monk, DH or druid. Monk + DH have similar utility + a 5% dmg amp, although dh is slightly better.
Druid is stupid tanky and one of the more simple tank specs to play.
For dps, Moonkin is great because it brings a fair bit of utility, as well as burst.
Hunter brings a bit less utility, but a bloodlust, and again, burst.
Mage is decent, it bringst bloodlust, burst and an int buff, but a lot less utility than the other two classes.
I wouldn’t recommend a melee dps, because melees are generally less desirable in m+ currently. If you’re going with melee, probably rogue, because a rogue controls 5 mobs on his own, while interrupting all of their relevant casts.
Otherwise I believe shaman heal is the most valuable healer for boosts, simply because he brings the interrupt that’s sometimes missing due to the lack of a fifth player.
If your answer is for you, whatever is easiest for you, whatever you play best.