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Modifier keys, command, option, shift and control, can be a problem on the Modbook because, without a keyboard, they work differently.
As their name indicates modifier keys alter a pen's actions — a click does something different depending which modifier key is pressed. This works fine with a keyboard since the altered state lasts only as long as you hold the key down. Using a virtual keyboard, the modifier key stays in the pressed state until you ‘un-press’ it. It is easy to forget to ‘un-press’ the key and the slight darkening of the key in the pressed key is easy to miss if you are not looking for it. This is a regular source of annoyance for me.
I have two suggestions for fixing this. First, there should be a clearer indication when modifier keys are pressed: a color or colors may appear on a dock icon, a menu item may light up, or perhaps hidden window may peek out showing the modifier key that is pressed. As part of this indicator there should be a convenient way to set or reset the modifier keys. Second, it should be an option for modifier keys to automatically ‘un-press’ after one pen action (a click or a drag).
Perhaps also, the utility that provides these capabilities could add three modifier keys not normally available on the Mac: middle click, 4th click, and 5th click.