A small idea of mine :
If I doubleclick above a column in the pattern editor (in the empty area where it either displays the previous pattern or a black space, depending on the settings) the row below that gets selected. The reason is simple : it is easy to select a whole track for editing (with the shift-end or alt-a shortcuts), but to select only a specific row I have to drag the mouse all through the pattern (unless I do miss something here).
edit : oh, okay. placing the cursor at the end of the pattern and pressing shift-alt-a does select the current row. still, this might be a good idea.