Foreword: I am making this argument to encourage voters to go with Empire-based options over Dwarf-based options. I do believe every word, though.
I think there's a solid argument to be made that if you want to help the dwarves long-term, you should be picking options to help the Empire in the short term.
"But Deathbybunnies, you buffoon, surely if we want to help the dwarves we should be helping the dwarves?"
Well, in the short term you'd be right. But the Karaz Ankor is currently in a somewhat odd position. It has achieved significant successes in its recent past, that inhibit its ability to do much else for, like, a generation. So any really big pushes won't be happening for 20 years on the outside (40, really.)
Meanwhile, I think we all take it as a truism that humanity is generally on the rise. The Empire is solidly the Karaz Ankor's closest ally, and half of the Empire will kill the other half before that changes.
But paradoxically, despite being on the rise where the Karaz Ankor is juat starting to get back up, the Empire is much more fragile than the Karaz Ankor. The former is made up of squabbling counties that have been together a few hundred years since they were last all trying to kill each other. The latter has been in more or less this exact situation for the last few thousand years, give or take a wobble down and up in the last few centuries.
I think it is by now widely accepted here that if the Karaz Ankor is to reclaim its former strength, it will be on the backs of men. Karak Eight Peaks and the Expedition to Karag Dum only succeeded with human assistance, and that was without the Empire itself formally taking an interest. Imagine what could be done if the Empire was secure and united enough to actually help properly?
In 10 years' time if we help the dwarves directly, they won't have fire dragons living in their attics, and the Empire will be as divided as ever. In 10 year's time if we help the Empire, the dwarves will have lost half a corridor to those fire dragons, or possibly ousted them themselves, but our effect on the Empire? Will be much greater.
Humans adapt, and change, and grow quickly enough, that I genuinely think that helping the Empire will not just have larger returns overall, but returns large enough that the knock-on effects on the dwarves will be at least as large, if not larger, than helping them directly.
I could be wrong - we don't have hard numbers, after all. But I think the possibility is at least worth considering.