Here is an example script that I would like to produce that would use the Remote API (with changes in bold):

1. Run a build - executeBuild works for this
2. Get the build number for the build - executeBuild needs to return the build number
3. Wait for the build to complete - need new API to call to do this or one that can be put in a polling loop to check on status of this particular build (by build number)*
4. Get the build results for the build I submitted - need to have an API like getLatestBuildResults but that works by providing the build number and key
5. Add a label to the build results - new API to add a label a specific build result

My suggestion would be to change getLatestBuildResults to getBuildResults that allows for the build number as input and defaults to being the latest