Allow Install Profile to be set in settings.php

I work on some custom multi-site installations where users are allowed to sign up for their own web site. In the couse of that I have found that I needed to set up different install profiles for different levels of services/features. One of the things that I have made changes to is the install.php in version 6.x so that the install profile can be set from the settings.php using $conf['install_profile'], there by eliminating a users chance to choose a profile when they are installing their site. It really only requires a few lines of code and I think this could be a great addition to core, as many other items are allowed to be set in the settings.php. Why not the install profile?

original install.php Lines 94-103(7.x) or 77-86(6.x)

// Decide which profile to use.
  if (!empty($_GET['profile'])) {
    $profile = preg_replace('/[^a-zA-Z_0-9]/', '', $_GET['profile']);
  }
  elseif ($profile = install_select_profile()) {
    install_goto("install.php?profile=$profile");
  }
  else {
    install_no_profile_error();
  }

New install.php lines 94-106(7.x) or 77-89(6.x)

  // Decide which profile to use.
  if (!empty($conf['install_profile']) ) {
    $profile = preg_replace('/[^a-zA-Z_0-9]/', '', $conf['install_profile']);
  }
  elseif (!empty($_GET['profile']) ) {
    $profile = preg_replace('/[^a-zA-Z_0-9]/', '', $_GET['profile']);
  }
  elseif ($profile = install_select_profile()) {
    install_goto("install.php?profile=$profile");
  }
  else {
    install_no_profile_error();
  }

You would then simply set your settings.php with

$conf['install_profile'] = "my_install_profile_of_choice";

Hopefully this is a good idea and others would think so to.