Well, if it's working fine, why change it?
But just in case you get more visitors, you can put those 10 different if-statements in their own files. So in your main script you only have this:
if ($action == "something") {
include("something.php");
} elseif ($action == "something2") {
include("something2.php");
} elseif ($action == "something3") {
include("something3.php");
} // etc...
This way, you only include the file that needs to be run.
Diego