I am wondering whether it would be possible to use the app Anyfont to add custom fonts on iOS that Textastic could use. According to the Anyfont app description: "With AnyFont you can install additional fonts on your device which can then be used by other apps which make use of the device's font book."

https://itunes.apple.com/us/app/anyfont/id821560738?mt=8

Does Textastic use the device's font book?

The new Files app in iOS is the all-in-one place for file managers and it’d make it really easy to transfer files.

Textastic can support asciidoc following the Textmate extension but it is not in the list of supported language, please add it.

To detect man-in-the-middle attacks SSH clients are supposed to check the host key of the server, for example by comparing it with a known good key. Should the client neglect to check the server key (or an attacker manage to steal the private key of the server) the connection becomes vulnerable to active man-in-the-middle attacks when using password-based authentication.

Add host key checking to Textastic.

I would love to see Multicursor functionality similar to the one available in Sublime, Atom or VSCode. They improve productivity a lot and save a lot of double/triple typing or search and replace processes.