Planned completion dates

I have a two part question regarding planned completion dates. First: We have a custom form that Requestors use to put in a job request. In that form we have a field labelled "Date Needed". We consider this our "Due on Date". But once the request is entered and shows up in the request queue when we click on it the far right side where we can assign the request it auto populates with the next days date. We have to manually change that to match the date needed date every time. Is there a way to have that date auto populate with the "date needed" supplied on the custom form? Second: We also have requestors that put in unrealistic due dates. Like 3 days for a job that needs to be designed/bid out and printed with an outside vendor. In those cases we add all of those steps in the project tasks but the planned completion date changes throughout the process based on printing/delivery dates. We end up having a realistic Planned completion date on the project but the requestors don't have access to our projects so their dashboards still show the original "request" planned completion date. Is there a way to link these two so that when the corresponding project planned completion date changes so does the Request planned completion date? I hope this all makes sense. I'm attaching a photo to help illustrate what I mean. Thanks Tracy Parmeter