No. Control panel applets are dlls and AutoIt can't be compiled to a dll with the right function prototypes.
Wait actually it appears that you can register standard executables as control panel applets via the registry. http://msdn.microsoft.com/en-us/library/windows/desktop/hh127450%28v=vs.85%29.aspx
All variables are passed 'not byref' by default. Normally byref and byval parameters are distinguished by function overloads but AutoIt doesn't support that right now. You can always have _AnythingV and _AnythingR where the V and R are for value and reference respectively.
Local $txt = ""
Local $objWMIService = ObjGet("winmgmts:\\localhost\root\CIMV2")
Local $colItems = $objWMIService.ExecQuery("SELECT * FROM Win32_UserAccount", "WQL", 0x10 + 0x20)
If IsObj($colItems) Then
For $objItem In $colItems
If $objItem.Disabled = False Then $txt &= $objItem.Name & @crlf
Next
EndIf
Msgbox(0,"", $txt)