it's not mentioned in the 'TOTALCMD.CHM'. (looked twice; hope i didn't miss it)10.05.06 Release Total Commander 7.0a4 (alpha test version 4)
11.09.05 Added: Multi-rename tool: Support conditional text in content plugin variables, e.g. [="_v."tc.versionstring]
took me a while to find out that this feature already exists.