If you have a steel frame, has anyone ever had a machine shop tap the bike to take adjustable dropouts?

I've never had a bike that had them, but I bought a Lemond Mailot Jaune for my ex that had them. I've never really understood the benefit of why I'd want to incrementally adjust my wheelbase anyway.

I'd be much more interested in the new headsets MTBikers are using to change the steering geometry of their bikes by one degree. Can you imagine how many of us in C&V world would want to take old vintage racing bikes and make them more STish with relaxed geometry. Nobody likes a twitchy race bike on a charity century ride when you're thirty, but as we age some of the best C&V race bikes become less "rideable." Nobody wants to be riding a spooky handling quick twitch race bike while constantly reaching for downtube levers while fatigued. If they made this Jan Heine would start talking about how much it improves how the bike planes. I can't imagine using them to make the bike geometry have a steeper head tube angle, although people use them that way as well. I'd prefer slacker to bring stability to bikes that are already stable (STs).

I don't know if there is enough space in a 1" head tube to pull it off like they are doing with MTBs and to do this with threaded headsets, but its a thought:

AngleSet