The main thing we'd want that's not in hiking is pack weight. The big thing, though, is being able to accurately see what kind of workout we did. A lot of ruckers also hike and would like to be…
Yep I'd love a field for "weight" so I could put in how much weight I carried on the ruck
I would love to see a Ruck activity be added with the ability to add a pack weight. With the amount of people in the military using Garmin devices that I know that want this feature is crazy never mind…
For VO2max, since it would be more or less guesswork anyway with extra weight, just record your rucking activities with hiking (which doesn't record VO2max for that exact reason) or trailrunning (where you can disable VO2max). You can always change the activity type afterwards to whatever you like.
My VO2max drops about 10% every time I do a rucking session or two.
There is a simple solution for that. Since at the Trail Running you can disable the VO₂max calculation in the activity settings, use that for the rucking, and use the standard Run activity profile, or a separate copy of the Trail Run (with the VO₂max option enabled) for trails without additional weight. In that way, only relevant runs will influence the stats.