Hey,
NO!!!!!! That is a great idea!
And to even take your idea further, sometimes it's a good idea to have a little dictaphone/minicassette player handy so you can record yourself humming, this is useful for when you have an idea for a melody but aren't near your keyboard, sometimes you forget what the melody is after a while...you play back the tape when you get home figure out the notes in your sequencer. A friend of mine does this for music, lyrics, or other musical ideas and it has been very useful.
Take care,
Nick