I was able to successfully start a new session from bash with the following command:

am startservice -n com.termux/.app.TermuxService -a com.termux.service_execute

Even adding a title worked fine (I am referring to the real title in bold, not the "terminal title" in italics that you can change via ANSI escape sequences):

am startservice -n com.termux/.app.TermuxService -a com.termux.service_execute --es com.termux.execute.shell_name "My Session Name"

However, I was unable to keep the current session in the foreground while creating the new one. I tried using the session action extra for the service execute intent, but to no avail:

--es com.termux.execute.session_action "VALUE_EXTRA_SESSION_ACTION_KEEP_CURRENT_SESSION_AND_OPEN_ACTIVITY"

and

--es com.termux.execute.session_action "VALUE_EXTRA_SESSION_ACTION_KEEP_CURRENT_SESSION_AND_DONT_OPEN_ACTIVITY"

I also tried to pass the corresponding integer directly, which did not work either:

--ei com.termux.execute.session_action 1

resp.

--ei com.termux.execute.session_action 3

So, I have a couple of questions about using the activity manager to control Termux sessions:

1. Is it at all possible to add new sessions to the sidebar without bringing them to the foreground?

2. Is it possible to close a specific session without killing the whole service?

3. Is it possible to switch between sessions?

4. Is it possible to add a title to the very first session (or, more generally, to apply com.termux.execute.shell_name to the current session without creating a new one)?

Many thanks in advance!