Summarization of Nathan's suggestions:

1. Improve connector & layout tools (required_before_further_SMIL_development/biggest_result_for_least_effort)

Question: Does this need to be done, independent of adding SMIL functionality?

2. Rewrite rendering pipeline

Question: Does this need to be done, independent of adding SMIL functionality?

3. Determine if there is an appropriate existing timeline-based animation tool to incorporate code

4. Develop animation feature list (required_before_GUI design/requires_SMIL_spec_review)

5. Develop detailed, consistent GUI design