Re: In hindsight what changes would you do
I would have liked the cave to be more useful. A nicer batcomputer would have been a start. Instead of keeping his "arsenal" under Lucius' roof, Bruce could have kept the spare Tumblers in the batcave (a Bane assault on the batcave would give Bane access to those Tumblers). Maybe some sort of detective lab set up in one place, with equipment ready to be used. A physical training area to keep Batman up to peak condition.
Having all this stuff would have also indicated Bruce's inability to fully let the Batman persona go, despite "resigning". He has all this detective / workout / transportation etc. equipment out and ready to go, so that at the first sign of real trouble he can return to crimefighting.