Hi Roos,
we have the same problem.
for vigilance we used categories Vig1-Vig4 and used it in 25% of the sequence pictures (sometimes one vigilant behaviour is just 1-3 pictures, sometimes it is several seconds).
For all other behaviours we did not separate (and in vigilance it also did not work really well)
You could also add different classes of the same behaviour (vig1x, vig2x etc. walking1x, walking2x etc. )
That´s the only possibility I see.
Or you will have to separate your sequences into single pictures (not just 120s as the divider bot say <1s)
Best
Olli