With pen you use only 2/3 fingers depending on grip to hold the pen while with mouse you use the whole hand and your accuracy is not that good since you've got no limited area to stick on to.
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Two plays from Kira he made me upload because of quality.
https://www.youtube.com/watch?v=NJqn...ature=youtu.be
https://www.youtube.com/watch?v=srsbKAQI6WA&feature=youtu.be
https://www.youtube.com/watch?v=8gnhZ9JO0IE
Watch it till the end.
http://i.imgur.com/6AoDc2w.jpg
**** accuracy lol.