How to select entire words with Tmux’s mouse mode

Here's workaround that I found online:

When you insert the cursor in the middle of a word and start dragging, and the whole word gets highlighted, backtrack the cursor a little then resume dragging in the desired direction. The rest of the word will be 'released' and you will only select the text from the intended point.

No. In order to implement mouse-select-pane, tmux must capture the mouse from the terminal (like any other terminal application which supports the mouse). In most terminals, including putty, this means you need to use shift for standard copy and paste. It is impossible to have both mouse-select-pane and the putty clipboard work without shift.

However, the latest development tmux (in the Subversion repository) support using the mouse to copy directly into tmux paste buffer (with the mode-mouse option turned on). It also supports syncing with the terminal clipboard on some terminals (xterm at least, although I'm not sure about putty).