Can I use dvdwizard with NTSC material?

Yes you can.

Use the command line option -N (--tvnorm)

#> dvdwizard -N NTSC

or

#> dvdwizard --tvnorm NTSC 

or set it in the config file like this:

TVNORM="NTSC" 
Get more Joomla!® Templates and Joomla!® Forms From Crosstec