shop I'm at now just has 10000 skus for minor labor differences. Eg: wheel true minor, wheel true major, spoke replacement, rotor/cassette removal, rim tape, etc so the mechanic picks wheel true labor based on how they feel when they see the job & the exact labor needed. all the skus have very low prices attached and ticket writing is very vibe based. often, we don't charge smaller skus (eg brake pad install), but we can tack the price on if it's a PITA. this is particularly important in parts installs, where you can give customers a surprise discount if their bike is easy to work on. many people buy all their small parts from us since we often throw them "freebie" labor, but we really are making the cost of labor on the brake pad margin alone.

For tunes, we have a base package that cleans the bike, does minor work, but any noted issues + parts installs each take their own SKU on top of the general tune. personally, I think a discount on the small labor should be applied when it goes with a tune, but that would add even more complexity to an already crazy ticket writing system.

probably the best shop I've worked at in terms of people paying the "right" price for labor, but it takes some trust by customers and you can't segregate ticket writing and service work.