We've designed a work-around.
If you want a vowel with an acute (like é), type that vowel with a / after it. For example, to mean á, type a/ in the workbook form blank.
If you want a vowel with a circumflex (like ô), type that vowel with a ^ after it. For example, to mean ê, type e^
If you want a vowel with an umlaut over it (like ë) type that vowel with a " after it. For example, to mean ö, type o"