Feature request - Possible to re-read charts on the fly?

Just wondering... would it be possible to implement, in the API, a function that makes charts-plugin to "reread" available charts. This would make it possible to plug in a SD-card or USB-stick and let the charts-plugin update charts "on the fly".
This function could then be called on from the plotters.

Or is it better to make charts plugin scan on a time base?

/regards!