Open all insert plugins GUI on channel :
[shift]+[alt]+[left click] on E button of a channel.
To close all of them [shift]+[left click] on E again.
this doesnt work very well if you have a keycommand for : WINDOWS - SHOW / HIDE PLUGINS (to close all plugin windows)
it then reverses the order of the shift alt E button function. Because its all toggles. Please try for yourself. I think this should be improved.