Continuing to investigate dual degree options

For a while, I've been hoping to add a second major in CS to my current course of study in biology. The tricky part is that the CS program - and the College of Engineering in general - at this university is extremely competitive and transfer is not easy. As I heard from an adviser, apparently they consider me a transfer student due to my previous college experience, which means I don't have to be held up with the pre-engineering program, but also means there isn't an obvious path to entry into CS. I recently contacted my adviser again to get more specifics on that, but in the meantime I'm considering taking the next chemistry class online over the summer to free up space in my fall schedule. That way, I can take the next two foundation CS classes simultaneously despite them being moderately intense.