Can't "prepend" a phone number from a text, document or website?

Question

When the Pre recognizes a phone number in a text message, e-mail, document or website, it allows you to click on the number to call it.  Great so far.  Unfortunately, once you do so, and completely arbitrarily, the phone won't let you make any edits of any kind to the phone number except to add or delete from the end of the number.  Every phone I've ever had has allowed me to "prepend" a number (to, for example, add an area code).  More to the point, there is simply no good reason for the Pre to prevent me from making whatever edits I want to the number.  I should be fully able to hold down the orange key and move the cursor anywhere that I want within the number and then make edits, just like I can when I enter a number manually.  Unfortunately, for no apparent good reason, the phone allows no edits of any sort to any number I've clicked on from another source.
Can anybody suggest a workaround, or do is this just one of those bizarre "what were they thinking" type things I have to live with?
Post relates to: Pre p100eww (Sprint)

Answer 1

Yeah, and I can also copy and paste the number instead of just clicking on it, but both solutions completely and entirely defeat the whole purpose and convenience of being able to simply click on a number in another source to dial it.  I don't want to have to add numbers I'm going to be calling only once to contacts just to make small changes before I dial them, and then have to delete them from contacts when I'm done.  There is a reason that users can simply click on phone numbers in documents and texts to dial them, and that is convenience.  Not being able to make simple edits kills off some of that convenience.  Workarounds like adding to contacts or cutting and pasting kill almost all of it.