Just checked it for PW3: Amazon.de as well as Amazon.com both have the same link:
https://s3.amazonaws.com/firmwaredow...hite_5.8.9.bin
Could also be a local flag "support active documents" which survives updates if already set in an older firmware. Just like your jailbreak...
OTOH, my friend bought a PW3 a few weeks ago, immediately made the jailbreak and updated directly to 5.8.7 - and active documents are supported in his device. Just asked him explicitely.