I personally already use the DirectoryIndex command, so I agree with you there gecko
I'm curious though, aside from listing categories, is the home.php file used in any other URL structure? I'm just concerned that there might be functionality in home.php that might be blocked by the robots.txt file
I haven't checked into this, so if anyone can post with certainty regarding the existence of home.php in any urls that are NOT category-specific, that would be great.