Experimenting last night, I determined that the wonderful Calibre tool will let me reformat files into a style I prefer (moderate indentations, no blank lines, to indicate paragraphing) -- and if I prefer something else in the future, I can always do that.
I then realized I can't do that with my Harry Dresden series, since I bought it (in a right-now frenzy) from Amazon, complete with DRM. Well, technically I could jailbreak the files - I understand there's a python script, and I have python installed to experiment with Calibre's source - but that would be dubious-at-best legally and a clear violation of the Kindle agreement. And if I ignored all that and did it anyway, putting said jailbroken-and-reformatted files on the Kindle would be Just Plain Dumb. So there wouldn't be much point.
Pfeh. Another instance of DRM content being inferior to pirated content. A pity I'm mostly law-abiding. At least I can load the files into Calibre's library, if I want to bother.
(And comments are disabled, as this is ancient and I'm just getting spam.)