I dont think that will help. Are you trying to get more pumpkins, or to get the 2 you have to grow bigger? The extra vines/leaves are needed for the plant to photosynthesize and help the pumpkins develop. Bury your vines whenever possible to encourage more root development.. that will help more I think.

I am new to this too....are you saying lay a section of the vine in a trench and bury it?

Yeah if you want to, that's best, or mound some dirt on top of vines... The added benefit is that this helps them survive pest attacks better, especially the dreaded squash vine borers. I check for eggs before I bury vine segments!

Here's an example of a vining zucchini I grow called Costata Romanesco. It routinely grows roots from its vines hoping to find soil...

You can see in the upper left of the pic a rootlet that's not even near soil lol. This particular zucchini isn't as productive as some, but is quite vigorous. Some squash varieties don't root along the stem as readily as this one, but many will.