If I was omniscient, would I feel the need to create? No I wouldn't.
You mean you know what you would be like and what you would do if you were completely different from the way you are now. Right now you are a mammal with so much brain tissue, with a local vantage. You see out of your eyes, for example, from one point in space. Your eyes select only certain portions of phenomena to notice and your conscious mind only notices a tiny fraction of that. Your senses are limited and you experience only a small portion of reality directly, clouded by your psychology, culture, the point in history you live, etc.
But somehow you know what it would be like to know everything and how you would behave. Amazing.
I don't even know what I would do if I was given a million dollars. I have some guesses, but how it would change me, what I would do in total I only have guesses about.
If I could read minds, I have some guesses about how this would change me, some of those guesses I feel pretty confident about, but I am not sure. Overall though I know that I would be surprised to find how this affected me.
Just that one little step towards omniscience is too great a step for me to be entirely sure, remotely, how this would affect me and what I would do.
If I look at my life, I see many instances, regular ones in fact, where changes in myself or resources ended up changing things in ways that I never expected. Learning a foreign language, the first long term relationship, learning self-defense, all had results I never expected or could have predicted.
But you, somehow know, what it would be like to shift from being a subjective creature with limited knowledge and awareness to what amounts to being non-locally aware of everything and being objective.
Wow.
I think people wildly overestimate the ability of deduction in these kinds of matters. As if we can apply logic to things we have never experienced nor has anyone else we know. It's really rather unscientific.