I’m thinking of using the OptionTree plugin for my next theme but just have one hang up before using it on themes, it requires PHP5 . That’s not a problem personally on my local server or my web hosts but I have a feeling not everyone’s host is quite there yet.
WordPress 3.2 will require PHP5 but it’s listed as spring ‘11.
Maybe I’m just worried about nothing but is it too soon to force PHP5 in themes?

