DataGrid's row behavior

[MrNobody]

I was wondering if I could change a few things about DataGrid's behavior...
first of all, I'd like to make everything un-editable by default and whenever
someone clicks a column in a particular row the whole row gets highlighted
(as if you clicked the row header).

Then it must be uneditable so If I click right on text it does not go into
an edit mode (I tried setting readOnly true on the GridColumnStyles and it
make it so I cannot edit the text but it still activates some kind of edit
mode, where it highlights the text, puts a blinking cursor next to it, and
changes the ContextMenu which contains options like Cut, Copy etc...

Then I need to remove the ability to insert new rows (when you click the
last row header (with the asterisk) it creates a row which you can edit) I'd
like this ability disabled for now too....

Now herer's the tricky part, it would it be nice later when I would like to
edit rows, that the user has to ' unlock' a particular row (via a right click
option), which would highlight that particular row and allow them to edit the
values for that row only. Then they click something like a submit button to
commit the changes.

Can any of this be done?