Can (Need) I a non trivial ACL for working on behalf of directory owner and group?

Hello,
Can I or need I a non trivial ACL for working on behalf of directory owner and group?

This the initial point:

root@host:/var/apache2/2.2# ll -d htdocs
drwxr-xr-x   2 root     bin            5 Jun 12 10:05 htdocs

root@host:/var/apache2/2.2# ll -d htdocs/*
-r--r--r--   1 root     bin           90 Jun 14 08:20 htdocs/favicon.gif
-r--r--r--   1 root     bin          318 Jun 14 08:20 htdocs/favicon.ico
-r--r--r--   1 root     bin          287 Jun 14 08:20 htdocs/index.html

I'm wondering if I can add a non-trivial ACL in order to let user1:staff create and modify files on htdocs but keeping root:bin and the "apparent" (traditional) permission for Apache, ie, root:bin.

Note: I think there's a traditional way where the owner:group prevail after modification of anyone else, but if this is possible, it would be too permissive. I only want user1:staff being capable of that.