The readme file shows a way to do this with || (OR) and && (AND) but it's not working. Any help would be very appreciated. I've tried:
!is_tree(array(2356,1123,121,117,34,1164,1026,1119,2322)) || !is_single()
(!is_tree(array(2356,1123,121,117,34,1164,1026,1119,2322)) || !is_single())
global $post; return (!is_tree(array(2356,1123,121,117,34,1164,1026,1119,2322)) || !is_single());