You know, I have the Alchemist 1x12 combo, and I wondered the same thing with the tap tempo for the delay. I've only had the amp for about a week (and get to gig with it tomorrow - yeehaw!) so I'm waiting until I get super comfortable with it, and the amp also seems resilient - in that it doesn't break down within the first few months of use. But, I'm definitely a tinkerer at heart, so...
If you think about it, that switch on the front is just a momentary switch of some sort. I've worked on a few amps / rack preamps in the past, and I would bet that if there was room for a 1/4" jack to be mounted on the back panel, one could accomodate a footswitch tap tempo. It won't have fancy LED pulsing showing you the tempo, but it should do the job just fine. I'm not condoning anyone do this with their amp though - modify at your own risk!
All that said, if the amp gets through the honeymoon period and performs well on a few months gigs, and I'm finding I'd like a tap tempo - I plan on cracking it open for that purpose.
I'm new here too... so, hello!