In short, Satanic Magic (being concerned with the individual and not mass consumerism) is a self-serving tool, and as such, your individual taste will reflect in your ritual chamber. If you feel like something should be there, it probably should. If you feel something seems magical to you and it is not listed in the standard tools outlined in TSB, than incorporate it anyway! It's about what works for you.
Exactly. My wife and I don't really have anything elaborate set up...but we have found a need to use fire. Our outdoor grill gets double duty.