I couldn't find a smarty modifier to do this automatically, so here's the plan:
In your smarty.php file, add this code:
Code:
$smarty->register_modifier("substr", "substr");
Right above this line:
Code:
$mail_smarty = $smarty;
Then in your templates, you can say:
Remeber that the 1st character of a string is in position 0 so the 2nd character is in position 1.
Hope this helps!
(This is untested, BTW)