In every project I have exactly one line to use tabs:

hard_tabs = true

Other than a couple already mentioned, I like match_block_trailing_comma. Besides the symmetry, trailing commas in general are good for potentially reducing diffs in the future.

But really, I’m not that bothered.

I tend to set use_small_heuristics to max. Because ut annoys me when the it doesn’t use the full line width when it could