If you read the recent postings on this thread then it will avoid repetition in that you actually don't need me to tell you
:....airports biggest single comercial user is FRA which as it happens is GA. They provide more business than any of the airlines at MME.
Onion it is not a sound argument to suggest prioritising any potential development project within DTV's budget just to appease volume GA movements at DTV. Putting it another way, do you imagine that even if this were practical that GA or FRA as you note would be more happy to pay significantly higher landing fees over the minimal inconvenience due to occasional peak traffic volumes.
Is it not that the lower operating costs are a primary reason as to why FRA are at DTV at all ?
Where you are is in a vicious circle, it's revenue generation specifically from pax that is needed to fund development in airport concessions etc., not expecting that you will be more attractive to airlines by increasing their landing fees to pay for the provisision of a taxiway whereby there may, dependent upon wind direction, be a minimal delay in taxi time.