Which is better, two arms or three?
Possible utilisation of grisms, or gratings in quasi-littrow
Utilisation of charge shuffling for on-band/off-band identification images, and are such identification images useful?
As we change from one galaxy to another, at a different redshift, can we manage without retuning the grating?
choice of optimal filter (is 40Å enough bandwidth? or too much?) - where to place it in optical train?