Firstly, thanks for the improvements to the Filters.
If going through the GUI, you cannot start a filter name with a number. But, you can edit the .nbi file to get filters starting with numbers.
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I'd like to see the ability to filter by Poster.
Some of the groups are getting a lot of spam from specific posters, and it would be nice to be able to filter them all in a single chunk.
Some of the posters have similar, but different, names, so Delete All Posts from Poster isn't really an option.