This has most likely happened to every Civ player before, getting stuck on a small island and not be able to move\expand at all untill you discover Map Makeing. To combat such a problem from becomeing a game ending thing I have this idea. Tech Research times would be based on your surronding terrian. So if you are on a small island with say 80% water in every direction, you would have say 1/3 or 1/4 the time to research anything involving ships and water units. Also note that in order to avoid makeing an exploit out of this which I am sure most if not all of you would reconginze, At the begining of every age for each Civ the computer would reevaluate your Civ so say in the Ancient Age you got stuck with a small island but due to this idea you were able to colinze a contient near you, you would lose this extra research at the begining of the Middle Ages, but then say during the Middle Ages you lose the contient due to an aggressive Civ but you still have that small island you would then get the extra research. This would of course only apply to ocean tech, unless any of you can think of another tech that would need.