Would love for there to exist a graphical template editor for invoices and especially quotes. XSLT is complex and unforgiving, OneBill support takes time to make changes, all the XSLT editors I've found are expensive, and the preview process is clunky and time consuming (appears to be "1: Change template by hand. 2: Start upload process and validate along the way, if successful then... 3: complete upload of template. 4: Edit existing or new quote and re-save new version. 5: Download PDF of quote and review. 6: Rinse and repeat until satisfied."
This is not a simple process, regardless of whether the editor is good (WYSIWYG ideal)...upload with quick preview would be nice even if we edit by hand.