[Serusers] LCR Module - Does it support PSTN prefix digits?

Hi All. We have multiple PSTN gateways in our network. Some are our own and some are owned and operated by 3rd parties. We are also use ser-0.9 stable with the LCR module for call routing. Some of these 3rd party PSTN gateways require us to prefix accounting digits to the R-URI before sending the call to their network. So my questions is this; does the LCR module support a scenerio whereby it can prefix digits for specific PSTN gateways? For example, suppose I have 3 PSTN gateways. The the second gateway requires prefixed digits on the R-URI. When the fist GW fails, the LCR module would prefix the required digits and then send to the send GW. If the second GW fails, then the LCR module would remove the previously prefixed digits and then send the call to the 3rd GW. Is this possible is the LCR module Juha provides for ser-0.9 stable? If not, is it possible with the LCR module in the unstable CVS HEAD? Regards, Paul