It is not electrically conductive. Silver itself is, but while AS5 contains silver, it is not a pure silver paste. An electrically conductive TIM would destroy parts, and the company that made it would be bankrupt.
If someone applies so much as5 as to have it running down into the socket, they deserve whatever they get (a frustrating cleanup, and thats about it). Do some research before you make ridiculous claims like this.
As for the curing time, so what? Again, while there is better, AS5 is not bad, and will give better performance than the no-name TIMs that are often supplied with HSFs. A cure time doesn't reduce it's overal effectiveness, it just requires a procedure to get to optimal performance. I fail to see your point, other than taking the chance to get a hate-on for AS5. I don't even use AS5 anymore, I switched to MX-2 a while ago, and am glad to have done so, but just because I gained a degree or two, doesn't mean AS5 was worthless crap.