If you send me an example, I can try to reproduce it on my iPad.

There shouldn't be limits beside the restrictions iOS places on JavaScript execution.

Yeah, I have thought about that. Maybe I'll do something like that in the future.

Sorry, but this is not possible. The iPad doesn't support mouse input devices.

I still haven't found a way to enable this in UIWebView. I doubt that this can be enabled in third party apps. But if anyone knows - tell me!

GoodReader has a great sync feature. I'll consider adding something similar.

Textastic 3 supports custom syntax definitions that are compatible with TextMate.

There is a TextMate bundle for Go available at

https://github.com/AlanQuatermain/go-tmbundle

Here's how to add it to Textastic:

http://www.textasticapp.com/v3/manual/lessons/How_can_I_add_my_own_syntax_definitions_and_themes.html

I hope this helps.

iCloud would only really make sense if you own two iPads. I'm not sure if there are a lot of people who have own Textastic and two devices.

I use the official Dropbox API. It uses HTTPS for things like login and downloading files. It uses HTTP for less critical files like loading metadata and sending command to create folders or move files. I don't intend to change that.

On Windows, there is Sublime Text and E Text Editor which you can use to test themes.