radius fret-board.
Instruments- discuss specific features, luthiers, instrument problems & questions
My guess is that if you play in modern finger picking style it would be helpful, but I've never played a mountain dulcimer with a radiused fret board. I see that some banjos which have traditionally had flat fret boards are now being made with radiused fret boards. There are some dulcimer makers who are doing fret boards with a radius, but I can't remember who they are. As to pros and cons, I have no idea.
Ken
"The dulcimer sings a sweet song."