Greetings.
Jailshell does allow for backgrounding processes, we were able to do so in testing. If you find that you are unable to do so then there may be more to the environment that you are on than we are able to account for. It may be best to open a support ticket such that our analysts can take a look into what is preventing you from backgrounding the process through Jailshell. If you wish to open a support ticket, please use the link in our signatures to do so.
Thank you.