I was thinking about the same. From the viewpoint of implementing this into the wiimc, at least to me isn’t a good idea.
For me it should be implemented in somewhere else, like an scraper to keep wiimc neat, since cuevana.tv is just one of all those media linking web sites.
The effort must be put on VLCshares as well as other custom solutions.
There is already a scraper for cuevana.tv written in Python, my idea was to reuse the code for scrape cuevana and create a dynamic .plx file, that could be used for instance with an addition to a VLC coder for megavideo (because the HD issues of decoding for wii).