KAKU remote YCT102: use the 5th button?

[DJF3]

The KAKU YCT-102 remote has 5 buttons: 4 for devices and one for "all lights on/off"



HS Log entry: F0 (?) F All Lights On

Is there ANY way to use the 5th button to control an extra lamp?
The remote has a toggle for device 5-16 but that's not inceeasing the WAF...

Cheers,
DJ

One thing I haven't tried yet: use RFXCOM plugin to translate houce code F to G1, hoping that all device codes shift one, turning F0 into G1..