you can do this by mapping the group number to the LEDs:
################################################################################
# LED Map: assignes the LED shift registers to the Button Shift
# registers or special values
# Currently following values are supported:
# 0 Default Setting (see Map below)
# 1 Button Shift Register 1 (Button ID #1-#8)
# 2 Button Shift Register 2 (Button ID #9-#16)
# 3 Button Shift Register 3 (F1-F4 and Navigation Buttons: ID #17-#24)
# 4 Button Shift Register 4 (Button ID #25-#32)
# 5 Button Shift Register 5 (Button ID #33-#40)
# 6 Button Shift Register 6 (Button ID #41-#48)
# 7 Button Shift Register 7 (Button ID #49-#56)
# 8 Button Shift Register 8 (Button ID #57-#64)
# 9 Selected Group (1 of 8)
# 10 Selected Bank (1 of 8)
# 11-15 reserved
# 16 MIDI Status received for Button ID #1-#8
# 17 MIDI Status received for Button ID #9-#16
# 18 MIDI Status received for Button ID #17-#24
# 19 MIDI Status received for Button ID #25-#32
# 20 MIDI Status received for Button ID #33-#40
# 21 MIDI Status received for Button ID #41-#48
# 22 MIDI Status received for Button ID #49-#56
# 23 MIDI Status received for Button ID #57-#64
# 24-31 reserved
################################################################################
[/code]
So, assignment option #9 is for what you are searching for
Best Regards, Thorsten.