[GRASS-dev] Thin plate spline option in wxGUI Georectifier, missing?

Hi,

there seems to be no Thin plate spline (TPS) transformation in the wxGUI Georectifier. As i.rectify has the option, would it be possible to include it in the wxGUI Georectifier?

Paulo

p.s., does anybody know a good manual / tutorial with an explanation of the CLI way (using modules i.group + i.target + i.points/i.vpoints + i.rectify)?