SGP already allows you to setup a start position for focus, it's just not temperature based. Please see here in the "Filter Setup Dialog":
http://mainsequencesoftware.com/Content/SGPHelp/FilterWheels.html
Focus pt: Used to specify a starting point as well as to specify the offsets for adjusting focus on filter change when using an absolute focuser when Auto adjust focus per filter is enabled. Because of the way in which "focus on filter" works it is recommended that you set the focus position of your filters near the same ambient temperature.
Thanks,
Jared