Hasta La Motion!

1: I am working with a scene where I’ve set up shots sequentially using "frame range", then useing "Merge"s to bring them together. Problem is that even though the shots that are out of their respective frame range values still calculate all their effects for the frame, making it take forever to calculate each frame. Is there any way that I can tell Nuke not to calculate parts of the schematic that are out of range?

2: I am working with Sapphire, and most of the nodes have handles overlaid in the viewport. The wierd thing is I can’t figure out how it decides which handles to show. Is there any way for me to limit the handles that show up in the viewport overlay to only those that belong to the current node I have selected?