It might be possible. Drag the top of the velocity pane up as far as it will go. Now find a velocity handle with the value you're looking for - hover your mouse over the top end to see the value. Once you have an idea which horizontal line they lie on, you might be able to drag a selection round them.
DOH, I did try that at first, but I guess I dragged from velocity handle or something like that as it didn't work and I thought it's not possible.
Thanks for your reply, the way you described works perfectly fine.