Hi Leon!
The actual name of the driver is Wanpipe,
wanrouter is the script we run to start, stop, etc… it…
It is a Sangoma telephony card hardware specific driver… It can actually do more than DAHDI but with FreePBX/Asterisk it’s a driver we must load in addition to DAHDI…
We use it with cards such as these:
I don’t think there is much risk if you don’t have any DAHDI hardware but as the MTA gals/guys say “Your server, your rules”… 
(At one point in time I was really into mail servers (ie MTAs)…)
Good luck and have a nice day!
Nick