So I have been admitted to my first choice grad program in physics. However, I am worried about job security after my PhD, and was thinking of staying an extra semester or year at my undergrad institution to pick up a double major in CS. I already have 3/4 of the major (via applied maths courses), so it should be easy to do in a year. Is this a wise choice? Will my grad school frown upon it? I'll take some physics in the meantime of course. Money isn't an issue. Thanks!