For lenses in shutters I use an Auto Knips self timer for the click and a convex mirror (accessory rear view mirror from the auto parts store) for arranging the pose. Conveniently the Auto Knips also provides for timed B exposures up to 10 seconds.

What I really really want to figure out is how to do consistently timed self portrait exposures with barrel mount lenses. An automated lenscap? But how?