I'm using Google Script platform because I need to cross reports from multiple accounts (this is not supported by Google Analytics by default). Via script I can access virtually any information from Analytics API.
Regarding my problem, at the end I found a way to get the refresh rate I need, that is by pushing a JSON object from Google Scripts to a custom widget. This way I'm getting my info refreshed every minute and I also have other display options (like pie chart!). It was a bit difficult to get the correct syntax but it's working like charm.
Pretty impressive what you guys achieved with Geckoboard, good job!