RAMdisk on XP 32bit - brainstorming!

I'm soon upgrading my XP 32bit system with two new 2GB sticks of RAM. Together with my two previous 1GB sticks I'll then have a total of 6GB.
But from what I've read XP can only make use of a bit above 3GB for regular RAM for some complex reasons.

So I'm looking into the possibilities of using the leftover memory as a RAM-disk.
http://en.wikipedia.org/wiki/RAM_disk

I'd like to brainstorm a bit about that.  Things I'd like to get feedback on:

1. This RAM-disk program claims to use the memory XP can't use as regular memory for a RAM-disk:
"RamDisk Plus 9 has a most unique feature. Our patent pending technology can access memory beyond the limitation imposed by a Windows 32-bit operating system! In other words, RamDisk Plus 9 can use "unmanaged" Windows' memory e.g. above 4GB. It can also use the stubbornly inaccessable memory between 3.2GB and 4GB."
http://www.superspee.../desktop/ramdisk.php 

Has anyone tried that? Does it work well? Any drawbacks? (Note: even if there are great problems with that I'm still interested in the RAM-disk questions below -- 3GB is still a lot of memory for many cases so I could still test to devote a bit of that for a RAM-disk)

(The Ramdisk Plus software was brought up in this older thread that didn't catch on https://www.donation...ex.php?topic=10979.0 )

2. putting the XP page file on a RAM-disk: one (possible) benefit would be non-recoverability. Are there also noticeable speed benefits?

3. putting the cache of Firefox or other programs on a RAM-disk: speed benefits?

4. putting all of Firefox on a RAM-disk (via a script that copies Portable Firefox to the RAM-disk at each system start): would I get additional speed benefits, especially when starting Firefox?

5. Downloading: I sometimes use Flashget Classic to grab video streams. With many parallell streams Flashget easily freezes and seems to strain the harddrive. Would I avoid those problems by saving the downloads (and perhaps also Flashget cache or all of Flashget) to the RAM-disk and then only later, once all parts are save, move the saved file to a harddrive?

6. Are there any other good RAM-disk applications for XP 32bit (especially freeware/FOSS version that are actively developed)?

another partly related older thread:
https://www.donation...ex.php?topic=10348.0