The recent L4D2 update seems to have broken the "Finale Waves" vscript changes. Not sure if it's this plugin or the vscript file replacer (
https://forums.alliedmods.net/showthread.php?t=318024). I have the following setting and on L4D2 maps finale, double tanks do not spawn
"Finale Waves" "2,2,0,0,0,0,0,0,0,0"