Count on Robert Lee Simmons to deliver the menace or the madness with charismatic force. He’s been spreading his special electricity among different companies over the past couple of years, with key roles at Actor’s Theatre (Pillowman and Lieutenant of Inishmore), Collaborative Arts (Romeo & Juliet), and CP Summer Theatre (Rainmaker and Dial M for Murder). But Simmons probably hit peak voltage this spring at his home company, CAST, in the title role of Killer Joe, where his predatory menace was all the stronger in restraint.