Suggestions for the next php

Hi! I have been a PHP user since version 3.0 came out, and have seen it develop a lot along the way, but theres some things I find it lacks that it really should not. If people agree, I'll glady contribute to the PHP codebase. For example, multi-threading. Looking at the PHP sources, I can see this would be fairly easy to implement on some most server modules. Before I get fried by people for suggesting this, I know there are many functions that are not thread safe, such the ob_* functions. But as far as I can see threading would be well suited to some PHP tasks... I'd like to hear users thoughts on this. TIA, Stephano Mariani