Just add new satellite to your diseqc.conf file and use rotorng plugin to scan satellite or transponders.
Below is an example of my diseqc.conf. Here Sirius is on LNB1 output, LNB2 is Amos, LNB4 is HotBird. LNB3 is commented out, there is nothing on LNB3 output. Take a look carefully on a structure and write your own diseqc.conf.
# Sirius LNB 1
S4.8E 11700 V 9750 t v W15 [E0 10 38 F0] [E1 10 38 F0] W15 t
S4.8E 99999 V 10600 t v W15 [E0 10 38 F1] [E1 10 38 F1] W15 T
S4.8E 11700 H 9750 t V W15 [E0 10 38 F2] [E1 10 38 F2] W15 t
S4.8E 99999 H 10600 t V W15 [E0 10 38 F3] [E1 10 38 F3] W15 T
# Amos LNB 2
S4.0W 11700 V 9750 t v W15 [E0 10 38 F4] [E1 10 38 F4] W15 t
S4.0W 99999 V 10600 t v W15 [E0 10 38 F5] [E1 10 38 F5] W15 T
S4.0W 11700 H 9750 t V W15 [E0 10 38 F6] [E1 10 38 F6] W15 t
S4.0W 99999 H 10600 t V W15 [E0 10 38 F7] [E1 10 38 F7] W15 T
# Sirius LNB 3
#S5E 11700 V 9750 t v W15 [E0 10 38 F8] [E1 10 38 F8] W15 t
#S5E 99999 V 10600 t v W15 [E0 10 38 F9] [E1 10 38 F9] W15 T
#S5E 11700 H 9750 t V W15 [E0 10 38 FA] [E1 10 38 FA] W15 t
#S5E 99999 H 10600 t V W15 [E0 10 38 FB] [E1 10 38 FB] W15 T
# Hotbird LNB 4
S13.0E 11700 V 9750 t v W15 [E0 10 38 FC] [E1 10 38 FC] W15 t
S13.0E 99999 V 10600 t v W15 [E0 10 38 FD] [E1 10 38 FD] W15 T
S13.0E 11700 H 9750 t V W15 [E0 10 38 FE] [E1 10 38 FE] W15 t
S13.0E 99999 H 10600 t V W15 [E0 10 38 FF] [E1 10 38 FF] W15 T