Re: Creating a in game scope
My brother in law does competitive gaming... he just uses a sticky note, cuts out a small portion and it's stuck in the middle of his gaming tv.
Re: programming that functionality
It wouldn't be too intense for someone who programs or codes for a living, but it may be quite the task for someone unfamiliar with the trade. Not impossible, but a chore indeed. I would try to find a solution as mentioned above or just go sticky note style.
Humans are the only creatures that won't live up to the their potential. Give everything your all. When you die, die on E.
So I ask you, what do you intend to do now?