A Google Webmaster Help thread reports that there is an issue with some domains setting the crawl rate in Google Webmaster Tools.
The report came in from an owner of a .TV domain. The person said:
I have registered www.themediagroup.tv and themediagroup.tv with Webmaster tools and I want to change the crawl rate. But I keep getting an error 'Setting is restricted to root level domains only'.
JohnMu from Google confirmed the issue and said:
This looks like a bug -- thanks for bringing it up! If you want to change the crawl rate in the meantime, you can request the change through the problem-report form linked from the "learn more" text.
There is currently no ETA for a fix.
Forum discussion at Google Webmaster Help.
