I have made 1/2 Dwarves with almost every other race. After all, it is fantasy and what may not be an option in one world can surely be an option in another. In most of my worlds, if a PC can give me a good explanation as to how and why, I let it go.
Ability bonus: +2 con, +1 to two stats is good Darkvision: yes Movement: 30 feet. They do not get to ignore heavy armor movement reduction Poison resistance as normal dwarves Tool proficiency as normal dwarves (not skill diversity like half-elves)