As I said before, the song of rest is not that great since a leader usually already uses his Healing Powers at a short rest. If you could rest 5 minutes than a 10 minute Rest shouldn't be a big problem.
Huh? I thought the consensus was that leaders weren't allowed to use healing powers during rests. I've seen so many DMs nerf that, I thought that was pretty much the rule.
What I do fear is that the ability to mutliclass multiple times might get us some broken combos in the hand of a Min-Maxer.
There's something you have to remember.
1) That's going to take a fat amount of feats. You have to take the initiate feat just to start doing it. Then you have to take the various feats to gain the powers.
2) A multi-class power swaps out a class power for one of the other classes. Which means that you've still got a finite number. Not to mention the level limits for the various feats (4th, 8th and 10th, IIRC).
Also, don't the feats swap your
highest power? Meaning if you're 7th level, and you have multi-classed into two different classes, that you can only swap out your 7th level encounter power with one of the two, and
that's it? Can you keep your 3rd level or 1st level encounter power a multi-classed one?
3) Stats and Implements. Many powers are keying off abilities that the bard player may not have focused. Warlord powers use strength to hit, many of the benefits depend on a hit. Barbs, Rogues and Rangers use Dex or Str. Wizards and Swordmages use Int. Clerics use Wisdom or Strength.
So if the Bard wants to grab more than one class, he's going to have to have some serious Mad to do so, in order to make the most of it. He would need his primary Bard stat (Cha), his secondary stat (Con or Int), and then a third stat for whatever class. And if he uses a class that keys of Cha, Con or Int, then he's limited by the overlap.
Finally, I'm not sure how implements work with multi-classing.