Wolf-
From my understanding the reason why there are those who say the Chanuka lights are ????? ?????? even after the mitzva is over is specifically because during the mitzva one may not derive ???? from them, and therefore in the person’s mind he put that oil away for a mitzva so now he can’t use it for something else. However with Shabbos candles that ???? doesn’t apply, because they are made to have ???? from, during the time of the mitzva.
Trying to be helpful-
If I’m not mistaken the Beis Yosef (I think in the end of 678) brings down someone who says to burn it right away, because by keeping it around one might come to use it.