I love the @r snap to filter results to only those that come from old.reddit.com. Sometimes however, I only want to search a specific subreddit. In which case I need to manually type out site:old.reddit.com/r/<subreddittosearch>, which is verbose.
Instead, the @r snap could be expanded to support subreddits in the same format most people type subreddits, by using a slash as a delineator. Take for example this query I just performed where this feature would've been handy:
transport at destination @r/flying
This could also be generalisable to other snaps too, either via a plain direct URL path segment, or more custom mapping if that would help (I could imagine say @yt/mkbhd might only return videos from MKBHD, but this is out of scope of my specific feature request, and may be less trivial to implement).