So much for my one-word answer...
I agree, the documentation is a little lacking, or I just can;t find it... About the best I've found is hovering over the checkboxes in the config, which provides a short explanation, sometimes enough, sometimes not...
Questminion, I never tried that, I'm going to have to check it out...
I like the sidebars.. I use the left for lesser-used, but handy actions, like pet "spells" (call, dismiss, feed, revive)... I got used to having some healing potions, bandages, some food, and explosives on one, nice for quick-use in or between battles on the right bar, so I don't have to search thru backpack for it...
The second bar is good for selecting different Hunter aspects or tracking modes, allowing quick-switching between them without opening the spellbook...
The buff timers are cool, shows exactly how long you have left on your buffs (or potions, food effects, etc.)
And, yeah, I love the clock too, although I still lose track of time while playing...