It would indeed be handy if we could add points afterwards in case we missed something
in the meantime, till menion insert this option, you can add poi´s to a track with following steps

display your track, add one poi with attachement at mapcenter and store it.
Be sure
only your track and your added poi is selected in data-poi and data-trackexport it via:
menue/more/Share&Export data/Export map content
hide your created poi and your track in mapview.
In next step import this exported.kmz, have fun
