On other doubles:
Discuss if support doubles are mandatory or not. What about after 1NT intervention?
Game try double?
Discuss when dbl is negative or penalty after 1NT (overcall).
What about later doubles after you doubled a weak NT.
Lead direction doubles.
If you bid a suit and then double opponents cuebid in that suit, do you want the suit led or not? Example:
(1
♦) 1
♠ (2
♥) Pass
(2
♠) Dbl
What kind of support does this show?
(1
♥) 1
♠ (2
♠) Dbl
or if you failed to support before, lead or no lead?
(1
♥) 1
♠ (2
♥) PASS
(2NT) Pass (3
♠) Dbl
Simple one:
(4
♠) Dbl
Some Polish Club ones:
1
♣ (p) 1
♦ (2
♥) Dbl
and similar