It would be nice if...
Configurable for the instance the user (i.e., me) belong to.
Automagically converted the URL to use the above, and if the account of the link target is outside the configured instance, convert to double "@" form.
For example, I imagine if anyone belonging to @bsd.cafe pastes some URL from the tab that mastodon client is running, it would be something like ```
https://mastodon.bsd.cafe/@User/11111
and if anyone belonging to @bsd.netowork attempts to open the toot via the link, converted to
https://mastodon.bsd.netowork/@User@bsd.cafe/11111
with input to indicate the conversion is wanted or not on click.
Maybe annoying to implement, though.