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My touring experience is mostly in the Alps outside of resorts, and I haven’t done much mapping partially because IIRC last time I looked for guidance there was very little. With that background and reading what’s said here’s my opinion.

I’d only map somewhat well-known tours. You can ski so many things, but looking at a map you want to know the common stuff - how to approach or escape your adventure if you do something weird or just do a classic tour. I think an example of this are the Swiss ski-touring topo maps where they do this.

I’d tag piste:type = skitour but I don’t think I could be bothered with tagging the grooming at all. Ungroomed implies usually something resort-based that’s not groomed and thus turns into a mogul field. If there is a section on a cattrack because of a hut supply or so then I think that should be mapped as some kind of track and not as a skitour. Similar if a tour starts or ends on a piste - just let the piste track take over there. If you need to link a tour together from different segments then maybe a relation is better?

Most ski tours can be ascended and descended. Some are only decent but those are the exception and there’d I’d expect to mark oneway = yes.

Looking at ski-tour maps there usually are two kind of lines: solid and dashed. The latter indicates difficult terrain usually, this could be many things and you’d be looking for other clues on the map or look for other literature. Can range from “often not much snow”, to “difficult crevasses” to “climbing a rocky ridge”. Some kind of way to indicate those tricky sections - and get them rendered - would be nice.

A way to tag the “typical” duration would be nice.

Lastly it would be nice to be able to also tag the difficulty level of a tour (outside of the tricky sections mentioned above). The SAC (Swiss Alpine Club) have a well known scale and most others in the alps seems similar-ish that they have a single grade in 5 to 8 steps that includes some guidance on steepness, exposure, narrow or other technical bits etc.

I’d be great to have some page with dedicated guidance on how to tag ski tours!