Question: SARAM, specs imply that this space is addressable through both the program bus and data bus simultaneously.

Answer: The block of SARAM from 1000h to 1FFFh is configurable by the RAMEN bit. If RAMEN=1 its on chip, if RAMEN=0 its external. This block of code will be accessible to both program and data spaces. You can not define it so it is only accessible to one or the other.