Poor executive functioning is why I could never make myself start writing a paper prior to the day or two before it was due, despite the rising sense of panic I would get for weeks. (This is key -- it's not laziness, because good lord did I wish I were able to do the work. To me, lazy ~= apathy, and what I felt was just about the polar opposite of apathy.)
Poor executive functioning is also why, unmedicated, it was sometimes difficult to not let my initial emotional reactions just come flying out. It was like there was an express lane between my limbic system and my action system, totally bypassing my ability to control it. I would find myself snapping out something and as it was coming out of my mouth, I would be kicking myself and thinking "Why in god's name am I saying this right now?"
Medication has helped with all of the above and more.
What I will say is that stimulants also can have a tendency to put some people on edge and increase sympathetic nervous system activity, so shorter temper could be a side effect for sure. If it's affecting you that strongly, maybe speak with your doctor about a slightly lower dose?
Or is there a possibility that you only became aware of your tendency to have a short temper once you became medicated? An interesting chicken/egg question; I'm just asking rhetorically, mind, because I have a lot of similar questions.