PHP can do things like that. So any forums software written in PHP is able to do that just peachy keen. That's just an advantage of the way PHP works.
However, due to the way UBB's cache works, YourStyle is simply not a viable option. As it exists now, it is not at all compatible with the cache and requires it to be turned off completely to function. And since turning the cache off is a very bad idea unless you're fond of seeing your server be able to fry eggs, Tech and myself have decided not to release this publically.
Charles has said that 6.1 offers new functionality that is supposed to allow us to alter the cache enough to make this hack possible. However, I'm pretty dumb when it comes to Perl, so I haven't been able to figure it out. And quite honestly, I don't have enough time to really dig into it very heavily. Too many projects and too much schoolwork going on right now. So, this hack may be written eventually if I ever get enough time - beacuse it is something I've really wanted to do since a really long time ago. But it's just not very practical right now.
---Skorpion