Option to run server in background

[memeToasty]

Is your feature request related to a problem? Please describe.
I am using ftpd to quickly transfer applications to the Nintendo 3DS for debugging purposes.
Therefore I have the inconvenience of opening ftpd, uploading the files, exiting and finally running the application.

Describe the solution you'd like
It would be very helpful to have an option, to put the process into the background, so it would be possible to upload files on the fly.
I'm not so sure, if this is even possible, but applications like HorizonMod show that background processes are possible.

Describe alternatives you've considered
I've tried to understand how HorizonMod achieves to run a background process, unfortunately, I was unable to do so.

[Masamune3210]

https://github.com/jakibaki/sys-ftpd

[memeToasty]

Is something like this also available for the Nintendo 3DS?