I feel your pain. I have very slight scoliosis according to my doctor and I take care not to aggravate it by being very strict with my form in both the deadlift and the squat.
Sometimes, however, my enthusiasm gets the better of me and I end up tweaking my lower back and not be able to deadlift or squat for months.
As for your chiro ordering you to stay away from these two very beneficial lifts, here's something you might find interesting:
Spinal Compression From Squats and Deadlifts - Strength Mentors
Excerpt:
"If you feel you must do some type of deadlift and/or squat, a trap bar or heavy pair of dumbbells- which provides for a safer and more efficient line of pull due to the parallel grip hand position-are also nice alternatives. Similarly, barbell good mornings (and yes, this is a perfectly safe exercise if one knows his or her ROM limitations in regards to keeping a neutral spine, knows how to push back the hips, etc) and romanian deadlift variations with either trap bar or dumbbells (parallel grip again) are great movements and great alternatives for either the squat and/or deadlift."
Here's another interesting thread about Chiropractors telling lifters to lay off the deads and squats:
Chiropractor: "Lay off the squats and deadlifts" - Bodybuilding.com Forums
Post from one of the members:
I have lumbar scoliosis
I herniated two lumbar discs with surgery
I use a chiropractor
After surgery I squatted 350x5 and dead lifted 405x1