Oops, sorry I missed that. I would really recommend getting Addictive Drums. EZ Drummer might work easier for you, and it is cheaper. Just doesn't have the ability to sound as good. But either will make your life much easier.
'LE' means limited edition, so yeah, it is limited quite a bit. Cubase seems to have the best editors for MIDI stuff (especially drums), so if you wish to stay with what you know, I would recommend at least getting your hands on a copy of LE5.
Otherwise, you can always try Reaper for free. Not sure how good it is for editing drum stuff tho.
Anyway, I like the tune! I bet you could have created the drum track in EZD and LE5 in about 30 min. How long did it take you, the way you are doing it now?