I think the order of rules is wrong. I have been away for a few years so I am a but rusty but the more specific rules need to be at the top.
You have the general rules on top so the other rules wont get used.

existing connections are not rerouted. they just timeout and have to be re-established.

once an ISP is down, all new connections would go through the other ISPs.

how long does it take? pfsense should ping the target every 5 seconds and that is how long it takes to switchover.

...
I have one WAN connection and three local subnets and for some bizarre reason I cannot get the main LAN subnet to talk to any devices on the WLAN or DMZ subnets.

                            _DMZ (192.168.1.0/24)
                           |
                           |
WAN-------PFSENSE--LAN (192.168.1.0/24)
                           |
                           |_WLAN (192.168.122.0/24)

...

Your DMZ and LAN are using the same subnet, so that will mess things up. You need to have different subnets for each segment.

Thanks, i've understood
But i wondering "if i use Developper iso to setup an environment then i can rebuild pfSense kernel with my custom", i could or couldn't do that? Because, when i do follow http://devwiki.pfsense.org/DevelopersBootStrapAndDevIso, it allway check and update sources from http://gitweb.pfsense.org and others place.

You have to make changes to the builder scripts for it to do something different from what Scott makes it do....

I managed to install the 1.2.2 dev iso, but there is no /home/pfsense/tools directory

do I have now follow http://devwiki.pfsense.org/DevelopersBootStrapAndDevIso ? or did I install it wrong?

how do you create multiple interfaces?   I am very new to VMware....

anyone get the developer iso working on vmware?

I tried to get it to work on VMware player, got it to boot , but could not get it installed.

problems:
(1) I cant figure out is how to get 2 interfaces.
(2) what options do I choose in the bootloader section

The developers iso would be what you are looking for.

http://mirror.qubenet.net/mirror/pfsense/downloads/pfSense-Developers-1.2.2.iso.gz

try this : http://ftp.nhlue.edu.tw/pfsense/downloads/pfSense-Developers-1.2.2.iso.gz or whatever developer iso is available when you get to the mirrors.

I've tried to follow http://devwiki.pfsense.org/DevelopersBootStrapAndDevIso but the process ends at the last line:
 ./cvsup_current
which gives me "something went wrong while attempting installation of git."

I commented out the git section in cvsup_current

thanks. pls post url.

any chance of getting a dev iso for download?

I cant get to my pfsense for the next few days so I was looking for docs or forum postings about how to get it to work.

I have 2 WAN running and a mailserver. users need to access the mailserver through the WAN using http or https://mail.domain.com/
mail.domain.com translates to one of the real IP addresses I get from one of the ISPs.

if that ISP is down I would like the users to automatically get through to the other ISP.

www.dnsmadeeasy.com , www.netriplex.com offer this kind of outsourced service. is it possible to do this inhouse using pfSense?