For the vim lovers, this trick is quite good :
unbind [ # free the weird binding
set-window-option -g mode-keys vi # switch to vi bindings
bind Escape copy-mode # ctrl-a ESC put your pane in a kind of vi normal mode
bind-key -t vi-copy v begin-selection # start a visual select mode with v like in vim
bind-key -t vi-copy y copy-selection # yank with y
unbind p # free another weird binding
bind p paste-buffer # paste with crtl-a p