Offering climbing opportunities is a definite yes in my personal opinion. You should be able to do it in a T8 or in a T10. Some will love it, some won't care about it. My 1000g male actually still manages to climb and drape himself across his suction cup plants without knocking them down most of the time. Both the T8& T10 have the option of a basking shelf that they can climb onto. I just got mine and the sealant is curing so I can't tell you how my snake likes the shelf, but I know that Sauzo (? I think it was) has commented that his bp Dottie loved her basking shelf.
As for other enrichment options - introducing items with various textures, very small amounts of spices or similar natural items with scent not in water or on food (be judicious about this), occasional cage rearrangement, providing live plants, and target training have all been used by zoos and rehab centers with snakes with success. Always be careful with what you provide - if you're not sure it's safe, just skip it. Also don't start messing around with the cage until your bp is comfortably and consistently eating.