I read a post reply from Stephen a while back where he said that the AND operator did not work when searching keywords in Tags - this seems to be the case in v1.2.2 and also it seems to be the case between Tags and Title?
Has this been fixed in 1.2.5? (yes I know I should upgrade!)or if not any plans to do so.
I'm building a custom search form with checkboxes and dropdowns for to search across specific values in Tags and Titles and I really would like to use an AND!
You can use tag1&tag2 in the searchfield to find an image that has both tags. Does that answer your question? Otherwise you will have to wait until next week for an more qualified answer as sbillard is away for a few days.
Why don't you try a test install meanwhile?