Well, AGG (or alternative technology) is on the roadmap. In U++, everything is ready for the step (we have uniform RGBA Image, we have DrawData to store/print anything), but there is at the moment nobody working on the issue (AFAIK). I think that for somebody familiar with AGG, this should be relatively easy do achieve (hint, hint!).
As for switching to AGG completely, this was abandoned because of performance issues -> basic operations remain HW accelerated.