Embeding Fonts - Limiting the embeded range

So I’m using the Flex SDK 2 in combination with Flash Develop 3 Beta and all is good (actually FD3 is great if you haven’t checked it out then do so). I need to embed some fonts but I only need a small range a-z A-Z 1-9 so I’m trying to get the mxmlc.exe compiler option

[SIZE=-1]-compiler.fonts.languages.language-range <lang> <range>

e.g.

[/SIZE][SIZE=-1]-compiler.fonts.languages.language-range englishRange [/SIZE][SIZE=-1]U+0041-U+007E[/SIZE][SIZE=-1]

and also adding the following to flex-config.xml

<languages>
<language-range>
<lang>englishRange</lang>
<range>U+0041-U+007E</range>
</language-range>
</languages>

but nothing seems to affect the size of my SWF.

Anybody got this working?
[/SIZE]