Let me first say that I am primarily a collector and as such am working on completing a number of sets at any given time. I would find it really useful if there was an easy way for me to see exactly how many cards I am missing from each set and also their value. Often I like to focus on completing a certain set and this information would certainly make it easier.
Also I think the ability to be able to put all copies greater than X in your trade list would be a godsend. It takes forever updating inventory and then making sure any surplus cards are in the trade list.
Lastly I would really like a way to put all cards that I don't have in a certain set into my wish list without having to go through and clicking on each one.

Overall I really like this program, these features would just make it so much quicker to manage.

Cheers

Have you looked at the Edition Checklist view?

Yea I have, it's a good start but could be expanded with the features I mentioned.