New Modules will require PHP 5.2+
CMSMS 1.7 will require PHP 5.2+. This has been announced well in advance, and is accepted.
I have had PHP 5.2.x on my server for over a year now, most hosts are using it, and it's easily available in LAMP, XAMPP, and WAMP installs.
Therefore any new modules that are releasd by me will require PHP 5.2.x... this also includes new versions of existing modules. It allows me more freedom, allows me to write cleaner code, and to make the system just that much more usable.
I know some people are going to complain about this, but there ia no going back, the new OrdersToIIF module requires it... soon, Orders, and Products will too