We can scan your regulatory region by PlatProm (Shavkunov et al. NAR 2009, 37, 4919). Soon, the software will be available on line, but until then you can contact me personally ([email protected]).
BPROM should be fine. There is nothing special in the promoter of non-coding RNAs. If you are trying to determine whether an intergenic region contains a non-coding RNAs, looking for the classical stem-loop structure of a Rho-independent terminator might be easier.