Am operating the 787 currently, you cannot select the cabin altitude, and I believe the company cannot change the way the pressurisation operates. The ONLY time you will get 8000" cabin altitude, is a prefilght defect with one of the CACs(cabin air compressors), or an en route failure, which has happened to me. 787s are far superior compared with 777s for jet lag, feeling good/bad after a flight. I have !0k+_ hours on 777s and 1600hrs on 787s.
