I often find myself in need of replacing end-of-line characters with spaces, forming one huge line. Unfortunately, RESearch fails in this scenario:
1) Search from panels works fine, and its multi-line regular expression would be ideal for the purpose. But it can only search, not replace.
2) Replace from panels doesn't have the multi-line regular expression option, so I have to use Several line regexp. Unfortunately, I have yet to discover a search regexp that would work - even something as complete as [\r\n]+ fails, because (in case of CRLF line ends) it only replaces the \n, but leaves \r intact. With unix (LF) line endings, it works, but not completely - a large file (200+ KB) may end up with say two or three lines.
3) Replace from the editor works in this scenario, but tends to eat up available memory quickly (e.g. with a 265 KB file with 2667 lines memory consumption of FAR grows to 733 MB, and often the plugin crashes, taking the whole FAR with it.
I think a "multiline regexp" option for both Panel Replace and Editor Replace would solve these issues.