anyway / any mod to have this done at admin panel?

Thing is, we only really need debug mode when there's a problem and if it's enabled via the admin interface and we, for some reason, can't access the admin interface, we're screwed.

Because the generation time really isn't interesting other than when debugging/developing.

Oh well, if it amuses some people to show off speed (which I have to agree is not too interesting), then that's fine.

Changes /footer.php in the punbb root (do save a backup first PLEASE!)

Look for:

// Display debug info (if enabled/defined)
if (defined('PUN_DEBUG'))
{
    // Calculate script generation time
    list($usec, $sec) = explode(' ', microtime());
    $time_diff = sprintf('%.3f', ((float)$usec + (float)$sec) - $pun_start);

    echo "\t\t\t\t\t\t".'<br>[ <span class="punclosed">Generated in '.$time_diff.' seconds, '.$db->get_num_queries().' queries executed</span> ]'."\n";
}

Change to:

// Display debug info (if enabled/defined)
// if (defined('PUN_DEBUG'))
// {
    // Calculate script generation time
    list($usec, $sec) = explode(' ', microtime());
    $time_diff = sprintf('%.3f', ((float)$usec + (float)$sec) - $pun_start);

    echo "\t\t\t\t\t\t".'<br>[ <span class="punclosed">Generated in '.$time_diff.' seconds, '.$db->get_num_queries().' queries executed</span> ]'."\n";
// }

In text: I've commented out (using '//') the check for debug mode... if you have your backup, you could also just remove the commented lines in the replacement code.

It might be a better idea to suggest adding the line to config.php. For example, I have a local development copy of my PunBB board (because I'm modifying it) and the remote working copy. If PUN_DEBUG is included in common.php then I would (potentially) have to change that file every time I upload a new version to the server.

- more detailed error messages if/when something goes wrong.
- script generation time in the footer.
- no. of queries executed in the footer.

Enable DEBUG by opening up include/common.php, finding (line 26)

//define('PUN_DEBUG', 1);

And removing the two slashes so that it looks like this:

define('PUN_DEBUG', 1);