iPhone tweaks

Overall I am very pleased with the iPhone 3G after a year.  Like everyone else, I detest ATT.
There are things that could be improved.
UNDO! In the mail application, I sometimes accidentally delete a message.  I notice right away, but it is a pain to recover.  My several mail apps use different naming schemes for deleted messages. I sure I could fix that, but right now I have to check each of the Trash/Deleted Messages folders  to locate the one the iPhone uses.  Then I have to scan down the list of deleted messages because the table of contents is kept sorted.  I delete so much spam that there can easily be dozens of spams ahead of the message I want.  Once I find it, I have to refile it back to the inbox.  All thus could be fixed with one undo button.
MARKING – It is a common event that I scan arriving mail while on the go.  The iPhone keyboard is not so wonderful that I respond that way.  Instead, I’d like to mark the messages I want to deal with later.  I could refile them to a todo folder, but I’d rather mark or flag them in the inbox.  I’m not much for sorting email into folders.  I just create a sequentially numbered archive folder with a few thousand old messages every few months.  I’ve been doing this since 1978, so it is kind of set.
The iPhone could use the edit dialog for this.  All it does is let you mark mail for deletion right now.  Instead, you could flag messages with the edit dialog.  To flag a single message, you might swipe it to the left.
Other iPhone apps.  I use Google reader on the iPhone.  Whevener my daughter borrows the phone, she logs into her account on Google reader.  When I get the phone back I have to retype my own login data.  The Google reader app could make it easier to select from multiple sets of credentials.  Or maybe the whole phone could have a switcher so multiple people could easily share it.
The iPhone needs a way to turn off all phone functionality while leaving WiFi running. This is for airplanes with WiFi.
UPDATE Sept 12.
I forgot the most important improvement to Google Reader.  “Mark all items as read” should also return to the feeds view, rather than staying on the particular feed looking at an empty screen.  My feed reading style is to scan the entries, reading the ones that look interesting, then “Mark all as read” and move on.  I always have to click again to return to the feed list.