Yep! There's definitely some ways to calibrate the game outside of its current ruleset.
Using different dice materials or dominoes/blocks will affect gameplay. Metal dice feel a little less controllable, but def strike with more force. You could maybe build an advantage/disadvantage mechanic around heavier and lighter dice.
The no-TPK rule is stylistic. It's not essential, although it loosely aligns with swashbuckling fiction.
Goalie rules I hadn't thought about, and might get tricky with metal dice, but could definitely add a level of counterplay to the game.