If the worst comes to the worst you could always just resort to notepad...
I'm not really sure how your editor is stopping you from writing the script properly... I mean, mine sometimes thinks it recognises things, and does incorrect syntactical highlighting, but it doesn't stop me from writing ?> if I want to..
If you're having to write code around your editor then it's time you changed editors!
Personally speaking, I use UltraEdit 32, it's fantastic, I really like it.
It does good highlighting if you want it for HTML, C/C++, Perl, PHP etc. etc. and it's a fabulous hexeditor too, as well as having all sorts of useful features like being able to compare two files side by side...