Not sure what is meant by "user can't change it" .
You want to change the icon size used in the main menu from where?
One can edit the gtkrc and the icon size will be used.
Why does the human-theme have to change this setting?
** Changed in: human-theme (Ubuntu)
Status: New => Incomplete
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main menu's size is locked
https://bugs.launchpad.net/bugs/568346
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