In 'less', you can interactively add command-line arguments without leaving the pager by pressing '-': you can press '-S' to flip wrapping/chopping of long lines, and '-j11' to spawn 10 wor^W^W^W see extra ten lines of context above the match when searching!
Also, with '&' you can filter displayed lines, and it you can incrementally re-filter. '&!' to filter non-matching lines.
@amonakov `less` is more. No, wait...