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Warren Ellis' "I type in uppercase so I can see what the dialogue looks like on the page" thing has never made sense to me, largely because comic book lettering DOES NOT LOOK LIKE THAT.Credit to the people who letter my stuff - I do a lot of stuff that doesn't directly translate, but they almost always get what I'm going for.
The formatting I do in LibreOffice is pretty trivial: Left-aligned (command-L) with panel numbers for descriptions, centered (command-E) with capitalized names for dialog, and italics and bold as needed. At worst I find myself fiddling with whether there are one or two blank lines between panels, so doing the formatting myself doesn't get in my way.