Ability to dynamically change ribbon button at runtime

Our ribbon button actions are awkward! We need the ability to interact with them more dynamically at runtime. Ideas:

• Change Office.Ribbon.RequestUpdate() so that it can change a ribbon button's label at runtime, like the "Protect Sheet"/"Unprotect Sheet" button in the Review tab.
• Give us the option to create toggle buttons in the manifest and in contextual tabs, like Excel's native "Filter" button in the Data tab, or the "Bold" button.
• Change Office.Ribbon.RequestUpdate() so that it can remove a ribbon button, or change its icon, at runtime