"Make merging changes simple."
Early development of Subversion's own merge tracking support is currently underway. Email the development list if you're interested in participating in its definition or implementation.
A prototype of the above exists which is roughly equivalent in functionality to svnmerge.py. The protoype adds sqlite as a dependency, and supports both the FSFS and BerkeleyDB Subversion file system backends. Tasks remaining for the initial implementation are tracked here.