Comments/Ratings for a Single Item

People have personal pride in their variants (as we all should), but I have a basic idea that I'd like to approach in a more democratic way.  Let's see if we can test out different approaches and come to some consensus on a new variant.  This discussion would probably work best with 4 to 6 people.  If this paraticular variant's premise exists, please chime in.  I'd probably need to lead the discussion and ask the questions you can vote on, just to keep things orderly.

Here's the general idea, and let's just go from there: Share Squares.  I was thinking about having "share squares" with opponents being allowed to place both their pieces on the same square without any capture involved (or two of their own pieces).

So here are some things I'd like thoughts on...

1. is the center 4 squares okay?

2. should the 4 squares be more like 5 or more?  Less?

3. should the share squares change during the game?

4. should it be 2 pieces only per share square?

5. can two pieces of the same color exist on the share squares?

6. Are they always "safe squares" and if so, is the King excluded from the safety of those squares?

7. If they are NOT safe squares, would a capture be involved when, say, a third piece is moved onto that square?  (as in, maybe they should be maximum two-piece squares, and the third piece to move onto it gets to "capture" one of the oppenent's pieces)

8. If yes to the question above, can a pawn only threaten an enemy piece in the share square if it's "full" (two pieces already in it) but cannot move diagonally to take if only one piece (the enemy's) in that square?

9. Can pieces move "through" a share square if, for example a share square had just one piece inside it?