I agree. Petas can benefit from dana of not only food, but things such as cloths.
In one story (or sutta, I do not remebre clearly), king Bimbisara gave food (dana) to bhikkhus and his former relative (relatives from several mahakappas back) got that food and appeared in front of the king. But they were naked. When king narrated to story next day to Buddha, He said that they were naked because he did not donate cloths. So, king Bimbisara donated cloths the next day all his former relatives were clothed when they appeared in front of him again.
From this story it can be said that petas can accept/get things of dana, other than food.