I would like to make a feature request for asterisk, namely the ability to switch of the line identifier "9" or "0" for dialing. As far as I found out about asterisk, it is in most cases not neccessary to prepend a "9" or "0" in order to get a line for dialing. I can only speak for the European continent, that standard local numbers are at least 4 digits long. While there may be a number of people out there with only three digit local phonenumbers, they are more or less dying out, because numbers like that are no longer given out for new phonelines.
So I think it would make things a bit easier, if for numbers not in the phonebook, if asterisk would be transparent to the user and you could just dial the number without having to remember the additional number. It would mean, that any number that is longer than three digits gets a line automatically.