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Herlock Sholmes: Good one ! While one could argue that backgammon is a probability game anyway and that doubles introduce some "unsmoothness" to cope with, basically yes, they are just spices.
I would still say that in your game proposal the effect of a double sounds much more dramatic than a backgammon double - but since I am not playing any Dice Chess I could easily be wrong.
(kaŝi) Se vi volas ludi kontraŭ ludanto de simila nivelo, vi povas difini intervalon de BKR ĉe invito al nova ludo. Tiukaze neniu kun BKR ekster tiu intervalo povos vidi/akcepti ĝin, (Katechka) (Montri ĉiujn konsilojn)