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I would leave it alone for now. It is just the plants way for trying to compensate for the foliage it has lost. The longer stem is reaching out for sunlight and the sunlight it gathers will help provide energy to the rest of the plant and the others will catch up in good time.

This article will help: https://www.gardeningknowhow.com/ornamental/vines/virginia-creeper/virginia-creeper-control.htm

Propagating a Virginia Creeper is very easy; simply allowing a cane to lay on the ground in soft soil will allow it to root at every node. If you want it to root faster, bury part of the cane. When there is a good sized root ball under the vine- it doesn’t take long, maybe a month- you can cut the cane from the mother plant, dig up the roots and transplant it. If you don’t have time to wait for a cane to root on the spot, you can cut a section of the cane that is soft wood or semi-hardwood (still green and flexible, not with bark that has turned brown and is stiff) and bury several of the nodes under soil in a pot or where you want the plant to grow. Keep it moist. More than half of cuttings taken this way root quickly. It also drops seeds and starts young plants under itself that are easily dug up; look around the base of a mature plant and you’re apt to find a couple. And then stand back- this plant spreads fast!

This article will help with getting rid of Virginia creeper: https://www.gardeningknowhow.com/ornamental/vines/virginia-creeper/virginia-creeper-control.htm

About the only pest commonly found on Virginia creeper are a couple varieties of leaf hoppers. These cover their eggs with a white substance, which may be what you are seeing, and their feeding can also damage and cause the leaves to fall off. Some information on leaf hoppers: https://www.gardeningknowhow.com/plant-problems/pests/insects/leafhopper-control.htm
For positive identification, take leaf samples to the Extension Service. This link will help you locate the nearest one: https://www.gardeningknowhow.com/extension-search/

I've read some reports of Canadians growing virginia creeper, both in the ground and in containers. If you want to keep it containerized (some people advise this to keep it under control,) using something larger such as a half barrel would give you all the size you need. Or you could put it into the ground; a mulch cover of several inches should ensure the roots survive the winter. This article has some more advice: https://www.gardeningknowhow.com/ornamental/vines/virginia-creeper/virginia-creeper-maintenance.htm