Request: Make it easier/quicker to load waypoints on map for .tlog playback

When playing back the .tlog it can often be difficult to display the waypoints on the map. I know that I must "Read Waypoints" to get them inserted into the .tlog. During playback, the waypoints only display if I actively playback the moment that they were downloaded from the APM.
If I am skipping through a long .tlog I often don't see the WPs. Is there a way of forcing the WPs to load onto the map from the .tlog?

Start by reproducing .tlog playback while skipping through the log, comparing it with the moment when “Read Waypoints” inserts waypoints. Trace the playback and map waypoint-loading entry points, then define completion as waypoints from the .tlog appearing reliably on the map without needing to play the original download moment.

Written by the indexing model from the issue text.