Switch between syntax definitions

Nice App! It would be really nice to be able to manually switch between syntax definitions though (maybe in the file properties section, where the current definition is shown!?).

Example: I use Matlab scripts very often. An appropriate syntax definition is available, but normally the file extension is .m, which is associated with Objective-C in the Textastic standard definition. It would be much more convenient to just change the syntax definition used instead of renaming the file to .mat.

The same would apply for gpx-files, which use xml-definitions, but are interpreted as plain text…