[celeritascelery]

All of this is possible in the current Emacs.

1. You can already define what program opens a file in dired. You could even use detach it from the Emacs process so it stays open when Emacs closes.

2 we already have vterm, which has all the features you described.

3. There are ways to make this better. I am actually in the process of writing a blog post about working efficiently over tramp.

[jiffygist]

Thanks for vterm, that's just what I need.

For dired I do have my bindings (one for xdg-open on a single file, another for custom command on a bunch of files).