No more need for a mouse to copy parts of commands in history.
I never use the mouse for that (partially because the middle mouse
button is broken):
(Move cursor to start of word to copy)
Ctrl-Space (set mark)
(Move cursor to start of word to copy)
Ctrl-w (cut)
(Move cursor to new location of the word)
Ctrl-y (yank; insert cut buffer)
Or with the example from the video:
# type
mplayer -fs
# noticed that I need a long word from the history, so comment
# out the unfinished command line and store it in the history
<ctrl-a>#<return>
# look for the history line with the long word; the multi word
# search would be helpful
<ctrl-r>The_Voi
# Mark and cut the file name:
<move cursor><ctrl-space><ctrl-f><ctrl-w>
# abort editing
<ctrl-g>
# recall the unfinished command and insert the cut-buffer
<cursor-up><ctrl-e> <ctrl-y>
# remove comment and execute
<ctrl-a><delete><return>