So if they didn't sign the pact or had left this request out of it as you seemingly desire they would have taken it wholesale?

The Nazis were somewhat surprised by the complete collapse of the Polish government. They originally had not planned to annex the entire territory, but instead pushed for a surrender of the Polish to let the Nazis take the territory they wanted, leaving a Polish puppet state. When the Poles didn't surrender and saw their government disintegrate, that plan went out of the window.

The Soviets had other options, eg joining the west in guaranteeing Poland or signing the triple alliance even if it wasn't everything they wanted. Too much distrust pushed them away from this option. At the time the Nazis weren't that powerful yet and fighting a two-front war, even against a less-than-ready Red army would have likely proven to be too much. Instead, Stalin opted to side with the Nazis in dividing Poland and sacrificed western Poland to the fascist terror regime (inflicting their own terror on the east). Ultimately the Molotov-Ribbentrop pact was the final trigger for the invasion of Poland.

In 41 the Nazis had gathered enough strength for a prolonged campaign in Russia, which in 39 they absolutely weren't ready for.