In smart action, I can send ctrl/ shift/ alt/ win key with a duration. This should be extend to the normal shortcut gesture. Instead of sacrificing 5 hotkeys for a single one.

A display for the duration should be shown like Caps Lock... notification.
The notification should fade away according to the duration.

It will allow more flexibility and efficiency. In a lot of program you can perform different function like holding ctrl/ shift/ alt /win and click or scroll.

For example, instead of assign zoom in and zoom out that will occupy two spot. If I can assign ctrl (with a duration not click) to a spot and it can work with the scroll like normal, then I can save one spot for another hotkey.

For example, in zen browser holding shift and left click a link would open it with a small window for quick peek.