Description:
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I think can be very usefull, sometimes, to be able to make a custom global variable, like languages, configs, etc.. and working just like $GLOBALS but only with the value/values assigned. I'm sure more than 75%-80% of the Php users will be agreed with this change.
Imagine and array with some translation strings:

$lang = array(
    'bla' => 'some nonsense talk',
    'blabla' => 'More nonsense talks');

and now the 'trick'.. some function to make 'global' the $lang:
make_global( $lang );

or even set in the php.ini some configuration like:
custom_globals = "lang, config, more, etc, bla, bla"

and now we can use it on global scope
function test() { return $lang['bla']; }

is a 'nicer' way than
function test() { return $GLOBALS['lang']['bla']; }
or
function test() { global $lang; return $lang['bla']; }


Test script:
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-- none --

Expected result:
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-- none --

Actual result:
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-- none --