You already have elves in this game #ElfArcher xD And You already can obtain the legendary grimoire of magic ( Abomination Spell Book :D )
What You asking for would break consistency of the game, You play as Lona You don't have Character Creator, You already can change into some sub-races but having dwarves / dragonoids would make it into typical JRPG where You have 98125895 different races and 0 consistency between them.
I like what Eccma said few days ago "Things I add need to have reason in Lona World" - short and simpler version.
As for me dragons / dwarves have no place in Lona World, LonaRPG gives You freedom of Your build so You don't need "Final Fantasy" class system.
But... You know You could make a mod for this game? If You really want these changes so much... make them urself... or You can hire someone to make these changes for You to the game... there is even small category about modding on Lona Wikia... I think it's good place to start :x...