I'm afraid not.
There have been several that have asked for a way of making the thumbnail the same size, as it looks a little messy otherwise, but it's not been done anything about it as I know. How to get it to go over more than one line without it looking bad, I'm not sure. But If we could get ridd of the stack function, the leftover space could be used for two lines of text just fine I guess.
I think your second suggestion would be a little akward for most users. Might look nice, but as long as we can not assign an Artist or Series cover etc, I do not belive it would be very easy to find the right thing. If the Image with the right text had just jumped out of the screen (zoomed out for the screen like 130 - 150% or something) when hovering over it, it would sure look stunning. But I think it might have interfered with other thumbnails. And thus making it harder to navigate. Maby, maby not.