This mainly focuses on "Swipe from bottom and sides" in Navigation Bar -> Swipe Gestures.
First suggestion is to allow for customizable thicknesses of each individual gesture area, instead of treating both bottom and sides as one thickness, have three separate thicknesses for left, right, and bottom gestures. This can help when you want thinner side gestures, but a thicker bottom gesture. Also preferably a slider as opposed to only 4 possible thickness levels.
Second suggestion is to allow for customizable gesture areas, similar to how the user can decided where the Edge Panel is located, along with its thickness and length. This could be disabled or enabled as the user pleases, and can help with interference between the gestures and the applications.
Third suggestion is to disallow gesture priority, also can be per side/bottom. Sometimes an app has interference with the gestures, and as the gesture takes priority, trying to access the edge of the app becomes impossible. An example of this is trying to crop an image/video with a gesture thickness bigger than the smallest option.
Lastly, one bug encountered is when holding to swipe into the App Drawer while on YouTube, the Picture-In-Picture mode does not activate. It only activates if the user swipes to Home. Meanwhile, PIP mode activates just fine with "Swipe from bottom" mode or with "Buttons" mode. it is just an annoyance but should be fixable.