symbols for once (freeze), once (black), auto follow in the "time window" or small symbol in the board inside the thumbnail.
it would be good to see the playback type in every cue/clip/row for every file or see it in the time-window. at this time (version 1.56) i just have a symbol for loop. A symbol for once (freeze) could be an arrow with a pause symbol " → ll "
a symbol for once (stop) could be an arrow standard stop sign " → ◼ "
auto follow " → → " like this maybe?!
it would be great to also see those signs inside the board thumbnails.