Add a part, or tell us we’re wrong
Especially the second one. Every uncertain field is already listed in DATA-QUALITY.md; if you can close one of those gaps with a datasheet or a scope trace, that is the most useful thing you can send.
Three things are worth more than anything else here: a datasheet for a part that has none, a measured timing where the catalogue only has FastLED’s driver-tuned values, and a correction where a number is simply wrong. Guesses are actively unhelpful — a blank cell is honest, a confident wrong figure gets designed into somebody’s board.
Adding a part yourself
The whole dataset is YAML in the repo. A new part is one file, and the validator will tell you exactly what is missing, with a line number. The README has the walkthrough.