In config.ini, there is no way (or it is not described) to stop asking for aesthetics/functionality without setting a default value.
# The aesthetic condition of the devices that you are going to register.
# Legal values are:
#
# - A: Brand new device
# - B: Used, but no remarkable aesthetic defects
# - C: Light aesthetic defects (scratches, dents, decoloration)
# - D: Serious aesthetic defects (cracked covers, broken parts)
#
# Other values cause the value to be asked interactively.
#
# Default: (none)
VISUAL_GRADE =
In config.ini, there is no way (or it is not described) to stop asking for aesthetics/functionality without setting a default value.