Elgg/Elgg — comment on commit 5c0b61d35597677ddce30c99eccd765b8b9e1da1
File:  line 0
By cash:

I think it is complete enough for 1.8 given how much there is to do.

To support what you're talking about in a maintainable way would require rewriting how Elgg handles image files (which needs to happen at some point). It is not a simple thing to implement if you want decent performance.