This way the backup of my wallet does not need updating.
BIP32 fixes that, please read the thread.
Does not look like the official client supports that. I mean there is no automatic way of doing it. I am not running some additional software. You give me and address to send the coins to, I send them to that address. If I want to receive coins from you, I will give you my address (the same one). If you somehow manage to turn it into some other address while making sure the coins reach me - great.
OTOH, I guess this patch could be circumvented by pre-generating as many addresses as I need (transactions per block) and giving them on a round-robin basis. Which still requires giving possible a different address each time someone wants to send coins to me. OTOH, I could just give a list of them and ask to choose one at random. That is static, but still inconvenient (and most would choose the first one in the list anyway).
It is inconvenient, no matter how you look at it.
Using bitcoin correctly won't stop your government from tracking you, and isn't intended to.
What it can do, is stop everyone else from tracking you.
However, I believe that everyone should decide that for themselves instead of having it basically forced on them (yea, yea, "miners can choose with transactions to include in the block, so there will be at least one miner who run an unaltered client, so your transaction will be included some time before the end of the universe" but it is effectively forcing me to do this).
Just like millions of people use Facebook and share everything about themselves (I am not one of them).
However, this affects not only the destination but also source addresses as I understand it. So, if I have mined a lot of coins (and on Eligius, all coins go to a single address, can't really change it, can I?) I have to wait longer if I want to make a few smaller purchases? Actually, same applies to coins bought in an exchange - unless I want to spend time manually withdrawing to different addresses.
I like the current system where I can keep coins received by mining in one address (so if I see the notification that 1P5p... received coins I know it is from mining, 175... means LabRat paid dividends etc).