Hi Kovid,
Sorry, I am using the wrong words (sometimes not easy for me). I mean to save and load a search into a file like you do it for S&R in conversion. I can safe my searches in *.csr files, what is realy helpfull i.e. with different PDF conversions where I need to do steps in the correct order to have a good output. It will be nice to have a similar thing in Edit Ebook. It is as well nice for import my existing calibre searches in the editor. But this only is a nice to have. I am quite happy with your implementation.
Using filter and multible items is good idea to do this in an other way. I didn't recognize this. Thanks.