Hi
There is no method (at present) on VP to automatically add chapter reference points at set intervals, but there is nothing to stop you requesting the feature to be incorporated in the next release of VP.
Currently you can only add chapters to the sequence by moving the cursor to the point required and right clicking
.
Although it would be time consuming, if you want to have a bookmark at fixed intervals, you could set up a blank frame of the required duration equal to the interval you want. Add this to an empty track and use it as a "measuring stick", moving the cursor repeatedly to the end of the frame, adding a bookmark, clicking OK (no name needed) and then moving the clip along to the end of itself and repeating the procedure.
Nat