[Phanx]

The solution Leatrix posted is cleaner, but I've been running a mini-addon with your solution + that code I posted disabling the Raid Profiles panel from being clicked, and haven't seen any of the usual taint errors in BugSack.

Edit:
Since Leatrix has deleted his entire forum posting history for some (annoying) reason, here is the code he had posted to resolve the issue discussed in this thread by removing the Cancel button from the Interface Options window:

-- Remove the cancel button
InterfaceOptionsFrameCancel:Hide()
InterfaceOptionsFrameOkay:SetAllPoints(InterfaceOptionsFrameCancel)

-- Make clicking cancel the same as clicking okay
InterfaceOptionsFrameCancel:SetScript("OnClick", function()
	InterfaceOptionsFrameOkay:Click()
end)