Hi
VP is a linear editor and the timeline must have a beginning and and an end.. There will be a looping option for the preview screen probably in the next version but this will only be used during editing..
if you want multiple loops of a clip or sequence for an exported video it is simple enough to keep adding the clip to the end of the current timeline the number of times required.
You could also create a sequence of a number of clips and repeatedly add this to the time line.
Of course, when shown this will only repeat the number of times you have added it. Some external players will often have a looping option anyway which will keep playing the video over and over again until turned off.
Nat