Your comments

Thanks for sharing your use case. Currently there is no way to exclude certain files. There's a separate feedback entry for this at http://feedback.textasticapp.com/topic/107275-filter-exclude-files-to-download/

Will be fixed in v1.1.

The default extension for Markdown will be .md instead of .markdown in v1.1 when you try to save a newly created Markdown file.

Will be fixed in v1.1.

Will be fixed in v1.1.