Miguel, these requests makes a lot of sense, will be great additions to the package, please go ahead. Try to contribute it back! Xinha on comments is very good, although at the interface you might better offer an special button that launches the editor in a pop-up window, because having xinha for each comment box might clutter too much. Also you might consider using a lighter version of xinha, with reduced functionality. Attach files is also a good option.
