There are many ways of entering music into software. Playing it on a MIDI keyboard with the software tapping time, as presumably done by leeneia, is just one of them, each with its own pros and cons.

I think most of us are best off with the following method: choose the note value (length) on the computer keyboard with the left hand, play the notes on a MIDI keyboard with the right hand. This system is offered by all notation software I know of. It is particularly efficient for single-voice music.

The StaffPad method may be a miracle of technology, but its usefulness seems to be restricted to small pieces of music being notated by people who want immediate success without learning. And, of course, to those who want to boast their "way cool" acquisitions on parties.