the list here (previously used for setting up e-uae on ps3 linux) should be the same as using the ps3 pad on windows;
http://eab.abime.net/showpost.php?p=517365&postcount=22
as you can see, 'select' is button #1 as Toni says. This is not something that will be "fixed" in future WinUAE versions, as it is not a fault of WinUAE!