Hi,
I've just added a script to the wiki add-ons called i.points.reproj.
http://grass.gdf-hannover.de/wiki/GRASS_AddOns#Imagery_add-ons
It is a shell script that uses cs2cs to reproject the target coordinates
of a group's POINTS file. By running i.rectify directly to the new
target projection, a generation of resampling data loss can be avoided
(versus i.rectify + r.proj).
Hamish