Is there a stride setting for PIC32MX DMA?
The DMA in the PIC32MX can not skip any bytes. You can set the cell size and block size. To possibly achieve the effect your looking for you could use channel chaining, sometimes called ping pong mode. To achieve an uninterrupted stream two DMA channels are used. While one is transmitting the second is prepped and when the first finishes the second kicks in automatically. 

With this setup you could use a for() loop for instance to sort sort the data set to eliminate every one. Set the DMA to transmit. Then sort the data set for the second DMA channel and wait for the first to finish. When it's done the second channel kicks in seamlessly and you can sort the data set for the first channel.