hawkeyefan
Legend
in your darksun game can I play a hafling from the moon? or one that landed his space ship when you thought it was a meter?
A halfling crashing on Athas in a Spelljammer would be fine, I'd say. I don't recall if Athas had a moon or not, but I don't see why that couldn't be allowed.
Now, if you wanted to have a traditional spaceship and have laser guns and all that stuff, then I'd probably say no. But that would be true of almost any setting, barring such technology actually being the point of the adventure/campaign, such as Keep on the Borderlands or Iron Gods.