I am currently half way through a degree in chemical engineering/commerce

I am majoring in investment, corporate and quantitative finance.
I am actually really glad that i decided to take this path. Unfortunately doing the combined degree has meant that i will take a few less (4 or so i think) engineering classes than those doing just chemE by the time i graduate, but i personally feel that what i have learned studying finance has easily made up for this.
As an engineer, i think i would prefer working in more of a project management position rather than a "hands on" position, and i am often told that having the business degree behind me will help in this respect. Whether this is true or not doesn't matter too much to me because i have found studying finance very interesting (well, most of the time

) and insightful, so i won't ever say it was a waste of time. I feel that it has actually helped me quite a bit in "everyday life" when it comes to things such as money management, planning and investing.
If you have any specific questions about studying commerce with engineering from a student's perspective then i am happy to talk more about it. Somebody who is working as a professional engineer may be able to talk more about whether they think it is worthwhile career-wise, but certainly as a means of learning about business in general i am very satisfied.