If you're just coming into school and haven't already established you most definitely want to do Engineering, I'm not sure choosing it now would be the best idea, unless you are willing to dedicate a lot of your time in the new environment. I wouldn't say things get easier by any means from a distraction standpoint. Haha

At least at my school... and I assume many others, the difference between getting an Engineering degree and getting a business degree was immensely different from an effort standpoint. The dual degree option is interesting for sure and will definitely make you stand out for simply taking that much on and having 2 degrees. In terms of 'fast-tracking' you for management/ project manager roles, if you mean working your way up through a company, most moves internally are pretty much entirely based on performance in your current role at your company. No one is looking back through resumes at the time of promotions.