Hopefully the title of this post is descriptive enough.
As well-documented in the tmux manuals,
tmux launches a login shell every time a new tmux window or pane (split) is launched.
Instead, how can I configure
tmux to launch just one login shell per session (maybe the first window), and any subsequent window/pane created shall be a non-login shell?
If this is not possible, at least can I configure tmux such that when launching the server, it will read
~/.profile, but any window launched within
tmux shall be a normal (non-login) shell?