[ejvcrbcp] Variations on jumping

Rule possibilities on jumping and capturing for games like checkers:

Multiple jumps (chained jumps) permitted or forbidden.

Is a player required to capture if capturing is possible?  No captures required, at least one jump required (not required to make multiple jumps beyond the first), multiple jumps required (but player has option of which multiple jumps) until no more jumps possible, the multiple jump which captures the most pieces is required.

For a game like Lasca in which a piece does not necessarily disappear after being jumped once, are multiple jumps over the same piece in a loop permitted?