Setgid in usr/local ownership and permssions

Hi guys,
I created a new Virtual Sub Server this morning however things have gotten a little mixed up.

  1. what should default ownership of “/usr/local/” be?
    (currently i have 2 options…either “root:root” or “root:staff”)

  2. Virtualmin automatically added a “gid” via “setgid” to /usr/local/.
    Should i change the “setgid”?

Unchecking it on the permissions “setgid” check box does not work!
I also try to put a “0” in front of 755 (ie 0755)…this also does not work!

Does it matter if Virtualmin insists on having the “2” in front of 755 (ie “2755”)?

What “setgid” in ownership should /usr/local/ have by default?

is it a security risk currently “2755”

What Id does the “2” refer to compared with “0”?

What i have also noticed is that one of my subservers did have ioncube loaders showing up in info.php under Addon Modules. Since this cockup, that has now dissapeared!