Regular DVDr's can hold VCD/SVCD information (preferrably SVCD as it's closer to the actual original DVD resolution, thus looking that much better when being played back). Theoretically, you should be able to put 2 SVCD format movies or 4 VCD format movies on a DVDr, and as long as the burner software supports it, should be playable in your regular DVD player ... but definitely playable on your computer DVD.
As for DVDx, I presume you're talking about the software ... you mean DVDx, or DVD X Copy? DVDx is a stand alone program, that will take the contents of a ripped DVD, and compress it into VCD or SVCD format. Which you'll have to have another program to actually rip the DVD's (such as SmartRip). DVD X Copy is a DVD to DVD copying program.
Though it's illegal as all get out, yes, it can be deployed to copy rented DVD's to either DVDr, or CDr.
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