Feature request for better events support by items

[Nikita Zlobin <nick87720z gmail com>]

I'm using version 0.15, and noticed, that it supports fixed amount of
events, where are e.g., no click event. Besides of such fixed adding,
it would be nice to allow user to register automatically any event(s),
as easy as they are enabled for widget (that should be done before for
canvas widget, i guess).