Capture your own piece rule?

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RLopez05

What if there was a rule where you could capture your own piece (or maybe only self pawn sacrifices?), would that be an advantage or disadvantage?  I would like to see that in addition to chess960 it would help teach positional play right?

chr1s-u
This position is check from my own queen. I resign immediately after cap
turing with my king which also loses castling. 0-1