The user manual suggests it won't send the magic packet itself, but it should be capable of allowing you to do it from the internet (forward port 9 to the LAN's broadcast IP and fire away). There are posts on the Linksys forum implying it won't do it though.
I'm prone to agree with Paradigm - Linksys's ADSL routers have always been awful (in contrast with their routers without a modem which fluctuate from mediocre to excellent), so if this one's good it's an exception to the rule. If your previous ones have been worse then you've bought some real lemons
About its only interesting feature is that it does Annex M, which
this does not. The data sheet says something about using "port 1" (which I'm guessing is meant to be a switch port) as a WAN port too.