I'm fairly sure you can run WDS on 3rd party routers and open source routers such as DDWRT.
Hasn't worked on Linksys and Cisco routers that I have tried. Netgear "Universal" extender does not work either. I think Apple does some "proprietary" things. But, more correct to say that it would be "extremely unlikely" that Apple would work with another brand.
I do recall one post where a user claimed that Apple would work after a DDWRT mod or similar.....but he also noted that this was only with no wireless security.
Even if it did....WDS only operates at "g" wireless speed..and you lose half of that again when you add the remote extender. Not much attractive about a network running at 27 Mbps or so.