Would disabling zoom out be possible?

Hey guys, just a quick question.

I'm using Phoenix 3.11 (Before some idiot starts hating, I like it, I don't want opinions.), and wanted to know whether you think that it would be possible to disable the zoom out button in the room info box. But there's a problem, I only want this done for one room.

The reason why is when I zoom out this happens it goes all funny because of the ads_background and I don't want my users to see that :P

Thanks for any help or thoughts,
eMagic

P.S I know this has been done for public rooms like so: (Screenshot by Lightshot)

P.P.S (@mods I'm sorry I accedentaly posted this in the DEV section, please disapprove it.)