This isn't going to happen for several reasons: it's insecure, it would ruin the whole sharing aspect (require x plugin to open this save) and it's also not cross-platform, you'd need to compile your plugin for Windows (SSE, SSE2), Linux (64bit SSE, 64bit SSE2, 64bit SSE3, SSE, SSE2, SSE3) and OS X.
Well, it's gonna be locked so I'll make the (hopefully) last post. An elements folder would open up to so many vulnerabilities that the plugin verification would need to be taken care by the mods. More work for them :/ @ post below