At the moment, I think you can achieve this by setting an environment variable:
BYOBU_CONFIG_DIR=/home/user/.dotfiles/byobu
This should also make the symlink unnecessary.
Alternatively it might also work to just symlink:
/home/user/.byobu -> /home/user/.dotfiles/byobu
if that works for you.
At the moment, I think you can achieve this by setting an environment variable: DIR=/home/ user/.dotfiles/ byobu
BYOBU_CONFIG_
This should also make the symlink unnecessary.
Alternatively it might also work to just symlink: .dotfiles/ byobu
/home/user/.byobu -> /home/user/
if that works for you.