Wadda mean digital clock module? Just right click on the in-dock clock module, select Style, then Digital.

If you mean the Desktop Module version, that is up to the skinner. The Aero theme, for instance, displays the time both in analog and digital formats on the desktop clock module.

is windows 7 jumplist support likely for docked tasks?

Not yet. Windows 7 is still brand new, give it some time.