I know everyone seems to love the high mortality/failure rate of the game, but I and my players did find that it tends to get old.
So what you're saying here is that you'd like to see more imaginative and hilariously brutal ways of getting killed? I completely agree! =D
Seriously though, I can see why Krutzbeck would be frustrated burning 7 turns to relight his torch (no pun intended) but I think, as you say, that's just uncommonly bad luck. DTs have done more than enough to resolve the issue of bad dice rolls, IMHO. Adding something to further reduce the luck factor would begin to seriously infringe on the elements of the game that make it so fun to me (namely, random craziness and sudden, brutal death.)
Don't let that stop you from brainstorming some house rules if you find it necessary. To each his own. But in an official expansion I would find such rules highly disappointing. Making the game longer by extending or changing how the sun track works might be an idea I wouldn't hate though. It would make the loss of 7 turns less crippling and give everyone more time to die. =D
As far as what I would like to see in an expansion, I'd have to say first and foremost, MOAR TILEZ! At least enough to double the stack. Hero cards for all the other heroes in the Runiverse would also be cool, though I'm not sure how well that would go over in general if it didn't also include the figs (after all, not everyone who buys this game already has three copies of all the figs from the other games.)
More monsters would be cool, too. More of everything, really. But I think FFG likes to add at least one innovation in each expansion, and I'm not sure what new ideas one might come up with to really change the game.