ah and one more thing:
i know about the heiland stopclock. but it is a bit too expenisive for my taste. also i'm not that interested in f-stop printing. the only thing i need is a footswitch, a permenent light option and eventually one of those things that beep once a second for dodging.
I you really can't find a suitable footswitch that would fit, having one custom-made isn't that difficult. If you're not good with electricity and soldering, you can always find someone to make it for you.
I've posted a link to my solution several times already, and I'm probably becoming a nuisance, but what I did is to hook up a Palm Pilot to a relay which turns the enlarger and safelight on and off. Total cost was about 50 EUR (I got the Palm Pilot secondhand, you need an older model with serial cradle). I added the footswitch as an aftertought, hooked it up in about half an hour of work, and used the cheapest guitar footpedal that I found (bought new at a music store for about 12 EUR) - it works like a charm.
In short, if it sounds interesting, check out my page:
http://www.hrtranslations.com/photo/Palm-enlarger.html
The only downside is that the Palm Pilot software that I use can be adjusted down to 1 second only (so, not too precise for very fine timing adjustments) - but I never found it to be a problem.
You can also tweak this solution to actually use your existing timer, if you already have one, and if it has provision for a footswitch - you'll need a wiring diagram for the signal pins/contacts on your timer. In this case you probably don't even need a relay, since the footswitch only has to provide "on" contact to start the timer, and the timer itself does the rest.
HTH,
Denis