Wow yes that would be very nice for most of our editors, assuming it doesn't have regressions and that there is some way for plugins like Dragmath to be accessed.
(Probably too big for places where we need small ones like question editing and so on).
It's not a bad idea (obviously anything to give developers motivation is good!), but we still have to get Moodle plugins working smoothly first:
2.3 - admins get notified about new plugins
2.4 - admins can choose to update plugins via web interface
2.5 - admins can add new plugins to their sites direct from Moodle Plugins
At that point we can add some Paypal features to Moodle Plugins so that developers can request some small payment at the initial install time if they choose.
However, I would hope that mostly everything stays free because that is an important thing for Moodle and our users.
I think accessibility has got to be included in thinking about icons. And I think accessibility is probably reduced when adding icons as backgrounds via CSS ...
I don't see a path clear enough to push changes into 2.4 ... It would be great to have all this decided for 2.5 though.