unbind C-b
set-option -g prefix C-s
set-window-option -g mode-keys vi
set-window-option -g status-keys vi

unbind ]
bind P paste-buffer

bind-key -T copy-mode-vi 'v' send-keys -X begin-selection
bind-key -T copy-mode-vi 'y' send-keys -X copy-selection
bind-key -T copy-mode-vi 'r' send-keys -X rectangle-toggle