Introduce Import/Export feature for Custom Filters
Expose the underlying JSON/XML for Custom Filters so that we can export it, modify it in a text editor either by hand or with python scripts, then load it back into the custom filter.
For example I have my main CI filter with 50ish metadata types, and every other filter is a subset which I establish by cloning the "master" filter and deselecting metadata types. Whenever I make a change to the master filter I am forced to nuke all the the "detail" filters and recreate them off the master using the above approach.
So many clicks. My preference would be to manage all this as text-based files.