Verbalize load and go the moment in your assessment you realize that it is one. Don't say they can wait if they can, just go on with what you are doing. If they need to go NOW, say so. This goes for any scenario.
Yes, a basic can take PHTLS/BTLS a lot of services require it. As for more advanced course, such as ACLS, and PALS, you can take them for the knowledge, but probably won't get certified for be allowed to do any of the advanced skills. It would be mainly a course for you to get a better understanding of the procedures so you can be more familiar with the operations when/if you ever are put in the situation at work/volunteer.