1. Improved Classilla. I do not want to see the mobile versions of sites
You know that you can switch the user agent? Preferences -> Browser Copatibility and you´ll get the usual desktop versions if you select Classilla, FF or IE
2. Networking with Intel versions of OS X.
That should be possible with Netatalk. Later Netatalk versions (past 2.2) have just IP connections, but it should work without problems to browse the entire HD if you activate it within Netatalk.
3. Improved file system. HFS and HFS+ are decent enough, but man I want to put in a 4 TB hard drive in my G4 iMac and NOT have to partition it.
Is that really a problem? I mean partition size is 2TB for Mac OS 9 (with HFS+), so putting in a 4 TB disk, and do 2 partitions, ... or are we talking about hardware limitations?
BTW what is the limit for FireWire or FAT 32 USB/eSATA drives?
4. Opening and writing modern PDFs and Office formats. I would make OS9 my regular machine if I was not dependent on Acrobat and Office 2011.
That´s interresting. And very straight words. That´s interresting for me as well. The funny part, both things shouldd be doable, even by a single developer. As long as you can live with how, for example, Libre Office is interpreting modern Office documents? Because from what I read, every alternative producer is struggeling with Microsoft formats, and as soon as it comes to Macros from within Word or Excel, no other product is 100% accrate.
But Office 2001 isn´t that bad at all in my opinion. Docxconverter saved my live several times, and the 2001 suite still feels fresh and well suited for most things (except that docx and xml stuff). But of course I see your point.
5. Updated music client. I have a Pro server for iTunes, so I would much rather have streaming than local files for my OS 9 machines.
Ah, thats interresting, what does this server do? Is it locally at your other computer? If filesharing (as suggested above) will work again for you, could you live with iTunes 2, Audion or SoundJam MP streaming your music over the network, or is something else missing like codecs? Or do you talk at least about some cloud streaming from commercial companies?
6. Protected memory and preemptive processing. No more "this app forces a reboot or force quit." or Type 1,2, or 3 errors.
Well as I said several times I don´t belive in preemptive multitasking, it would kill our snappy OS, and everything would be lost in "OS overhead" again. But nevertheless, this thread shall not be the place for OS improvements, modern hardware or new drivers and such stuff. I´d like to collect things that concern user programs or could be done with 3rd party programs (like the filesystems - thats why I wrote "missing Mac OS 9 functionality" in the subject), and hacking the OS is definitely something different.