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I use the official Dropbox API. It uses HTTPS for things like login and downloading files. It uses HTTP for less critical things like loading metadata and sending commands to create folders or move files. I don't intend to change that.
You can try to use the TextMate AsciiDoc bundle to get highlighting for it:

Have a look at the the manual.
From the article: "Enabling the remote inspector on a UIWebView in an app running on the device doesn’t seem to work."
Wow, this looks really horrible to be honest :)
It will be in the version after the current 3.2.
Sorry, but I don't plan to do that. 

I try to merge duplicate feedback on the userecho forums though.
In the last few weeks I've managed to improve the performance quite a bit. These performance improvements will be available in the next update.
Ah, ok, you have to scroll down to see them. Looks like those are the same files, yes.
I don't know. I don't see any plist files in the settings app on my iPad.