Would be really great to be able to add notes to an invoice like a provider number, license number etc...
"Custom Invoice fields"
I agree with all the above comments.
Having a header option would be really helpful (just like AccountRight).
There are some types of businesses which require more fields than others, so it may be a good idea if these extra fields are attached to the company types when setting up the company. That way its only there for those who need it, and not annoying those who don't use it.
The other option is to have an option to turn on/off these fields so anyone can access them if they wish.