Well we don't even allow markdown in our editor. We do this to prevent people from turning normal 240 character post into 1000 words post on zappl.

Its a preventative measure against abuse, zappl is meant to host zappl data and when you edit data it messes with the filter method of only showing zappl content. Once app:"name" changes which it does when you edit a post.

We will look into how spaces and breaks are handled in the code on post to insure the quality of how you wrote the zap. Also as sames said we will be adding editing features soon to allow people to fix their posts.