Queen Castling Theoretical Chess Variant

What would be a theoretical consequence in a chess variant where the Queen was premitted to castle similar to how the King can castle!?

Only queenside castling would be feasible: castling kingside would involve moving the king out of the way - too much hassle. You're also relocating the Queen to b1/b8 (QN1), and the rook to c1/c8 (QB1), and any e.g. bishop attacking b1 or c1 would make castling with the Queen illegal.

So not only would castling be very troublesome to carry out, few people would find it useful: give one game of yours where queen-castling would have helped you significantly.

In all likelihood, not much would change.

It might help with certain back rank issues.

Actually, it could be very useful in the Queen's Gambit/Slav, when White has the half-open c-file with a bishop on d3: Castling queenside then would be fantastic when the Queen jumps to b1, controlling the b1-h7 diagonal, and the rook goes to c1, onto the open file. :)

In Omega Chess (the extended version) you can do this, and it is called 'Guarding'. Seems completely useless to me, you don't want to tug away your Queen in a corner, like you want for a King...

Interesting thought awesomeKiwi. Ill have to look into that more.