Can I blacklist an appindicator?
I currently have 9 indicators (old-style and new-style appindicators) sitting in my Ubuntu taskbar. In time I'm sure some of them will migrate to a better location (for example, I presume both SpiderOak and Dropbox are supposed to be under the mail indicator, just like Ubuntu One). Until then, I want to reduce the clutter!
In Windows there is an option to hide (but not remove) system tray icons. When you click on a reveal button, the hidden icons are revealed and you can use them as normal. Is there a similar function in Ubuntu?
 I could remove old-style non-appindicators from the
systray-whitelist, but it would be a major hassle when I want to show them again.