Yes, just copy the folder and rename one on the dslstats.exe files to dslstats1.exe. The only problem is that MDWS doesn't know which line is which.
create 2 mdws accounts. use username1 with dslstats.exe and username2 with dslstats1.exe
The WAN IP address detection gets confused
Wasn't aware of that issue, perhaps Tony will fix it one day.
I think he meant WAN IP address detection in DslStats, not MDWS.
I can't see anything stopping you running 2 instances of DslStats, for 2 separate lines, with both uploading to MDWS. Just make sure DslStats is installed twice, to 2 separate locations, and 1 of the DslStats.exe files is renamed. You need to check "Location of config files - with other DslStats files" under Configuration > Misc, in both instances of DslStats