Sounds like a good idea. I've added my vote to the count.
To make things easier for me I have added icons to the Account Action Bar, the row of icons at the top right of the account register. At a minimum the Action Bar contains the Account Actions gear icon.Click the Actions gear icon, click "Customize action bar".Select icons for New Invoice, New Payment and any other frequently used form.
Now you have one-click access to these functions from the account register.