I am very partial to Savage Worlds' handling of actions. There are just actions and Free actions (which incs mving your speed).
You can try several at once (but not repeat the same action without the right Edges - though there are maneuvers that allow multiple attacks for eg). Each extra action you take adds a -2 to ALL rolls. Actions without attacks are dealt with with Agility rolls.
Saga had a similar system for attacks (with the appropriate feat choice) with each starting at -10 I believe.
Anyway, I would like a simplified system like this with say a cumulative -5 penalty.
I like putting the choice in the player's hands - but all actions are Actions