Can I keep cards in my hand at the end of the round?
Yes
You can keep any cards in your hand at the end of the round that you didn't use, but it will reduce the number of new cards you receive. If you wish to discard any cards though, you must discard all cards in your hand and receive 4 new ones.
You don't have to make any trades if you don't want to, but we do recommend making sure you have a Power to use in the next phase, even if isn't the Power you wanted.
The Leader only reads aloud the script to get started and makes decisions when the group needs them to, but otherwise the Leader is the same as any other player at the table.