I have a couple pf question regarding custom themes.

1) What this setting suppose to do ?

Appearance -> Theme support - > Activate theme support

The Image that I'm working on is already patched for accepting 3rd party themes. Does this "Activate theme support" option patches the system to be able to accept 3rd party themes ?

2) How do I select custom theme as default for all the new user including the administrator ?

Appearance -> Theme support - > Default Windows Theme

So here I select the .theme file from the Resource directory of the mounted image corresponding to the .msstyle and shellstyle.dll in the same directory. 

Is this how this suppose to work ?

Any help will be greatly appreciated. 
Thank you.