In general I dislike the sit/rest mechanic immensely. It ruins all of my interest in the game to test and/or experience currently. It feels like you have to create and play as a Bard or Cleric to simply test and play through the A2 currently.
If you would like to retain the Sit/Rest mechanic please make it so HP/Mana fully regenerates while resting over 5-10 seconds. Having to sit and waste away hours of our IRL life's while our virtual character sits doing nothing on the ground is mind numbing. Please don't make RP'ing as a hobo (sitting on the ground randomly throughout the world and talking to ourselves for entertainment) a core game play mechanic.
Sitting constantly is not interesting, it is not compelling, mobs are constantly spawning around you while you are forced to rest, resting doesn't work, resting takes way too long, resting is a waste of player time, resting adds no value to the game, sitting/resting should be shot into the sun never to return.
Please have our characters regen HP/Mana out of combat like a normal game.