on the bmw v32 software disc in a paramter file (tioarch.tar/nav_mm.tio) for mk4 you can see the following:

equal_weight=0
compatible_weight=1024
strong_tp_station_weight=2048
pay_tmc_station_weight=4096
[pay_tmc]
xor_value=203
start_bit=6
rotation=1
encid_start_hour=4
encid_start_minute=2
tm_0_allowed=TRUE
tm_1_allowed=FALSE
pay_tmc_fallback_wait_period=120

so i think it should be capable of decoding pay-tmc, but i really dont know what 'conditional access' means and how it works. I also read that the Suna system here in australia is very similar to the iTIS in the UK