Above your BOff portraits there should be a cluster of little group command buttons. One looks like a little down arrow (or upside-down triangle) which allows you to tell your away team to move to a certain location on your screen. You click the down arrow, and then click on the ground where you want them to go. Right-clicking the down arrow will clear this command and make them follow you again.
Using this button you can manually direct them around all the 6-inch high rocks that they are too freaking stoopid to jump over. I know. The AI is wonderful, isn't it?