Well I left this bit out but yes I do understand how to read a tyre and understand what it is telling me. Now put this this way that if a person is smart enough to do wheel alignment my way you can bet your kanakers that this person would be able to read what the tyres are telling him. Now as for the other way around I would say yes that there are a few that can tell what their tyres are telling them but are not smart enough to do a wheel alighment my way.
As For rain camber on the road yes I know that and it does vary from road to road (2 lane to 8 lane) but in general we drive on the left hand side in Australia and you can adjust your toe in to reasonably match your steering for most roads where your wheel is straight 75% of the time and you are not fighting it most of the time
Fighting the steering wheel if I am reading your post correctly, is an alignment (ie camber or caster issue), rather than the steering wheel being straight from toe adjustment.
An alignment is set for road going purposes, so the tyres wear evenly.....to get it to your liking, which is seems you are on about, to me sounds like you are wanting your car set up for track work, rather than an every day commute, which is what 99% of people want
I will add in, the main cause of keeping a steering wheel straight, whilst driving along a road, is caster....Caster is a big factor in having the car drive straight along the road....Where the biggest issue would be, for an aligner is, in your instance, adjusting the caster correctly, which is only achieveable in these commodores via an adjustable caster kit, is being able to drive the car in the correct lane that you would and adjust accordingly.....by doing this, the aligner then would be faced with an irate customer, querying why so many kilometres have been put on the car, for a simple alignment.
This anger would come either in person or via a lovely site like this....or both......So, instead of just saying, no one can adjust your car to your liking, think of the flip side of the coin, on what us knuckle heads have to deal with and then comment.....
I can also tell you from first hand experience, where I have been abused for driving a persons car.....A friend of the customer spotted me driving the car, after an alignment...The customer came to collect their car and abused the crap out of me, because I was seen driving their car....After explaining the reason I drove it a whole 2 kilometres, the person settled down. So here's another first hand experience that us knuckle heads have to deal with, in the pursuit of customer satisfaction