This page demonstrates how you can setup popup menus that can be accessed by keybindings. Just press i.e. ALT-P to trigger the menu on the “page” link, etc.
Note that it's possible to have different menus too—and you can easily group them by class name.
DynarchMenu does not provide direct support for the above feature, but as you can see it's quite easy to “fake” it by assigning an onfocus handler for each link. Currently if you want to be able to popup menus upon keybindings, as in the example above, you have to use links (<a> elements).