Hi Mike.
Very upsetting to see your issues. I had a problem this morning when I tried to get in (unlock) my car by just putting my hand in the dorr handle. Both sides, and it wouldn't open. The key fob buttons worked. This is the first time this has happened in a spot I have parked the car many times before.
On you window opening issue, this must be related to the same frequency interference that you are getting with not opening the doors.
I believe your dealer should be able to change the frequncy of your fob and the car sensors.
Also, looking at a document I got off the US owner's webssite, the dealer should be able to disable the feature where you hold the unlock or lock buttons to open/close the windows.
Having said that, after seeing your problems and the car being drenched, they need to do some serious replacement of interior to get it back to new.
I am not 100% sure, but I think the RF frequency they are using for these systems is the same that is used by remote garage door controls, cordless home phones, etc.
If I am correct, and it is that frequency, Lexus, needs to upgrade there technology and move to the new (higher) frequency range which has a bigger spectrum and less overlap.
Hope you can get some positive results from the dealership.