For the manual installation thing.
Surge isn't really portable yet on any platform (there is a request issue for that so it might happen down the line) So it would be kinda messy to support that for the developers.
Portability is definitely not in the pipeline for the next stable release, and it would be the kinda thing that would have to be added in a stable release I think. If you want more control over the install I would suggest building from source or unpacking the .deb file.
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