Comment 7 for bug 546263

I would be DELIGHTED if this theme change landed.

I should point out one reason against, though, just to be fair: it's a tad better for accessibility that we specify which menu items are radio / check items and which are regular actions. I expect that's one of the reasons they are how they are.
On the other hand, though, toggle _buttons_ are indecipherable from regular buttons, it's not always clear that two groups of radio items side by side are separate groups, and the labels on check mark items should explain themselves (that they enable something), not the picture of a check box.

To solve the unsolved issues there, it's important to keep groups of radio items visually connected using separators. That is the case on the message indicators, but we should make sure this doesn't break any other supported apps and patch them appropriately :)
(And - though don't quote me on it - I think the GNOME HIG supports us here, so it shouldn't be a big problem).

Probably the best route to that is a Planet Ubuntu post asking for bug reports if the theme is changed.