Maybe, but I'm a little wary of mucking with list item tap areas like that - feels like an unnecessary deviation from standard UI in an app that already has far too many of those.
(as currently designed, though, 4.0 lets you make any list in the definition screen display like SENTS does, so if you'd like Pleco to give you compound words with their definitions as plain text with tappable audio buttons instead of as a list, you'll probably be able to configure it to do that)