Add the ability to add time varying annotation based on functions or filter output. Not just the animation time. (i.e. the max value of a contour or surface.) Or even support to modify animation time display so it shows in an hh:mm:ss format.
A new feature has been added to git-master (will be included in 4.0 release) to annotate using arbitrary values. Take a look at: http://paraview.org/Wiki/ParaView/Users_Guide/Annotation#Python_annotation_filter