Hi Julian,
really cool I will attempt to add that stanza to the boards.txt and modify appropriately for the sanguino and test and get back to you.
and of course my app uses pulsein to measure PWM from a CO2 meter(but can move to I2C) and a RCtime routine to read an HS1101 humidity sensor(and soon a MG811 Co2 sensor). so all will have to be refactored/re-engineered I suspect.
sigh
gwen
ps changes for sangunio follow