I don't know Gaelic at all, so I don't know how important these diacritical marks are. Umlauts are certainly important in German, but you can put an "e" after a vowel and everybody knows what it means - is there something similar you can do in Gaelic? Does Gaelic make any sense without the diacritical marks? I know it sure makes a difference in Greek and Russian.
While the fancy characters may look great here, they may cause problems in the downloadable version of the Digital Tradition database. Dick and Susan have done an admirable job of keeping the database simple, so it will work on just about any computer ever built.
-Joe Offer-