There’s no sense sitting then because the pause isn't long enough

Bosses: There is only *one* situation in which you won't want to sit between heals, and that's when you need to buy seven souls gold do two or more consecutive rapid heals.

There's no real wait for rapid heal to recharge, so there's no sense sitting then because the pause isn't long enough. One example of this is when a strider/pet user/kahuna somehow ends up 'tanking' a boss. It's bad, but let's face it - it happens a lot.

In those cases, unless they have good defense for a DD, you may need to rapid heal them many times in a row. In that case you'll need to stay standing because, facing a boss, they can't live through a 2-3 second pause sometimes.

If a HW or fighter is tanking a boss, though, and they seem to be tolerating the damage well enough to sit briefly while heal is cooling down, then you should sit.

If a HW tanks a boss I can generally heal all the way through and have full MP when the boss is dead.

Also, don't hesitate to tell the group what they should do. Even if someone else is party leader, it's a healer's role to keep the group alive and well.