You could give the layer time-remapping,
give the time an expression like this:
startIndex=1;
thisComp.frameDuration*(index-startIndex)
You can also give the position an expression like:
startIndex=1;
position+ [0,0,100]*(index-startIndex)
to spread all the layers 100 pixels apart in Z-depth.
You should change the value of startIndex to the layer-number of your first video-layer.
So, if for example: your camera is layer 1, your lights layers 2-4, and you have some text on layer 5, you should change the value to 6 since the first video-layer is N