Option to link per-space preferences

I often wondered how to avoid a llittle drawback, from my point of view, in Hyperspaces:
some of the preferences are local to each spaces (Show space name, position, scaling method, color, etc.) and that's good. Nevertheless when I want to activate it, I often want to activate or change it in every spaces.

=> how to make it simple (a sort of switch from local to glabal)?

My idea: why not add a simple usual keylock (padlock) icon, in the preference tab named Hyperspaces pref tab, at the bottom or just under "Options for Space N"?

Its label could be:
"(icon) Link the globalisable settings of every spaces" or "Spread modifications to each other space when possible" or...
(you even could add a longer explanation via tool-tip)

The use would be simple
- when unlocked, behave as currently: any modification affects only one space
- when locked, any modification is affected to every spaces.

Now to be perfect, how to handle the options that are not intended to affect every spaces? I see only 3 such options: label, background image, hotkey. I think the best way for Hyperspaces would be to simply ignore linking those 3 options, whatever the icon status is. (maybe with mentioning this restriction in the tool-tip).