<p>In short, yes. D has done an ED1, an ED2, one EA, and Rochester PR all with no trouble. You just have to wait for a non-acceptance ED1 to do the ED2, but regular EAs and PR are no trouble, just don’t do anything the obligates you to attend. Penn doesn’t even care if you do SCEA, although the SCEA school would not look favorably on you doing Penn ED.</p>