dialog - super hotkey mode for menus, selecting an item automatically selects ok

[cri]

I was wondering if it's possible to add an option for menu widgets,
to override the need to hit "OK" after selecting an item via hotkeys;
i.e. hitting a hotkey would select the corresponding item and also
automatically imply selecting the "OK" button.

Is this complicated to implement? Or just trivial? (hints into the
source are welcome :)

Of course you would loose the chance to fix typing errors, but for some
applications this can be sacrificed to have quicker menus.

A safer alternate approach could be the "double-keypress": a single hotkey
press would only select the item (current behaviour), a second press of
the same key in a (configurable) short time period would also imply OK.

Cri