These are the values that can be typed into any render pass field

disabled
combined
z-depth-norm
z-depth-abs
debug-normal-smooth
debug-normal-geom
adv-radiance
debug-uv
emit
mist
diffuse
diffuse-noshadow
ao
ao-clay
env
indirect
adv-indirect
shadow
reflect
refract
adv-reflect
adv-refract
obj-index-abs
obj-index-norm
obj-index-auto
obj-index-mask
obj-index-mask-shadow
obj-index-mask-all
mat-index-abs
mat-index-norm
mat-index-auto
mat-index-mask
mat-index-mask-shadow
mat-index-mask-all
adv-diffuse-indirect
adv-diffuse-color
adv-glossy
adv-glossy-indirect
adv-glossy-color
adv-trans
adv-trans-indirect
adv-trans-color
adv-subsurface
adv-subsurface-indirect
adv-subsurface-color
debug-normal-smooth
debug-normal-geom
debug-nu
debug-nv
debug-dpdu
debug-dpdv
debug-dsdu
debug-dsdv
adv-surface-integration
adv-volume-integration
adv-volume-transmittance
debug-aa-samples