You can clone with
HTTPS or Subversion.
Since my scripts rarely change Included Pages, it would be nice if I could force autoupdate to require manual intervention whenever Included Pages does change.
I use scripts for some websites that I don't really care about. If this restriction was enabled, then if the scripts go rogue, they'll be limited to affecting a limited number of unimportant websites and no damage will be done. If the restriction was disabled, they could silently poke holes in all my websites as long as autoupdate is on.