It would be great that we can play with spanish rules in Lidraughts. It would the very first spanish draughts engine and board analysis. Rules here: www.ludoteka.com/games/spanish-draughts/rules
The current plans for development are to expand features for the already existing variants, although very likely there will be more variants at some point. Most probably next variants will be without flying kings, i.e. English/Italian draughts.
Spanish draughts family ( see variants explored at http://mlwi.magix.net/bg/spanishcheckersvariants.htm ) is very interesting; and I would love to see some variant of them implemented on 10x10 board. I tried many of these variants, I particularly like Argentinian and Malaysian / Singaporean which are enabled in Checkersland.