It's very nice having the comments field. I like to use it to cut/paste the various prizes for that contest. Some contests have rather long prize lists which don't fit in the current short comment field.
Actually, Comment field was designed to store short things like UPC codes, bonus phrases and actual comments like "use DD-MM-YY for DOB". So, it's pretty short and does not really support scrolling and multiline.
It is possible that it's size would be slightly increased in one of future versions...