First have the option to reverse an inventory entry. Second add somewhere to put a description in that will actually show up on the advanced inventory. Example if you enter production both the type and description are "production" make it possible for the description to actually be meaningful - ex listing the field where the production came from. There is currently a notes field but I can't find where that note actually shows up anywhere. Third the option to add our own transaction types.
Can you tell me more about what you mean by adding your own transaction types? Do you mean beyond withdrawal, deposit, receivable, payable, or do you mean the dropdown for EX, IN, CA, etc.
What transaction types are you missing?