There's also 'walk' by Dan Cross, in /n/sources/contrib/cross/walk.c. Lsr's faster (bufio?), but I like walk's depth-limiting switch (and it sounds like you might like the quoting switch).
Dan also did sor ("streaming or") to apply various tests to files. The two in combination do very well for replacing 99% of find usage. See Dan's posts here: http://9fans.net/archive/2002/10/653 http://9fans.net/archive/2002/10/655 I see no reason sor wouldn't work with lsr, too. Also in Dan's contrib. I can't particularly say why either one's not in the distribution. First order, I assume the authors never submitted them for inclusion. Anthony