draft of my reply (hope it's not too offensive):
Dear professor ABC,
thanks for your observations. However, packages used only by people from a specific scientific community shan't be included in a general class like this one. As for multirow, I consider its usage a deadly sin. As for inputenc, the class works without it for many people.
I would like to ask you not to distribute any modified copy of actapoly.cls.
Sincerely,