Last time when I used MSWord (6.0 in '97 or so), I was able to select a line, a paragraph or a section if I clicked the left margin once, twice or three times, respectively. Moreover, the click-hold-down-pull-release movement selected several subsequent complete lines. (Maybe triple click selected a complete page, not a section, I don't remember exactly.) I can live without this feature but it was so convenient. I think I requested this feature many years ago, maybe in the bugzilla of OpenOffice but it doesn't exist in LO's bugzilla so I file it now.
In Word 2010: Single click - select line Double click - select paragraph Triple click - select all