Currently a user [like me] not experienced with using regular expressions and / or syntax of Everything is nevertheless still able to use its advanced capabilities: by pre-defining frequently used filtering expressions and putting them on the convenient to use drop-down list of the Filter Bar feature. But what if such user wants to combine settings of 2 different Filters, that a user has painstakingly come up with in a distant past? Like for example digging in Recycle Bin for just audio file formats but based on their Kind? A user is forced to use either the Bookmarks thus "polluting" the Search Edit box and / or use this Search Edit feature in a totally manual way. So there goes the convenience. But if a user could add a second [but preferably even more] Filter Bars then mashing / narrowing of search criteria would be so much easier and faster
Secondly: also more than just one Search Edit box could be beneficial in the same way
Although I reckon that this second upgrade could start to complicate things greatly, leading possibly to a whole festival of glitches. So maybe [for starters] there could be a kind of Mini Search Edit / Search Extra, that would not succumb to changes in Filter Bars and would not receive input from Bookmarks - and be editable only by hand? Thus would allow for a quick further filtering of already filtered results by e.g. writing in it something as simple like
.FLAC\temp\