I have recently changed from using the standalone version of Roster 1.7.3 to WoWRosterDF 1.7.3 using SigGen v0.2.6

Here is my issue: With the standalone version of Roster & SigGen, I was able to link to my sig/ava using http://<domain.com>/addons/siggen/av.php/<name>.png to display my image on a phpBB2 forum. With WoWRosterDF & SigGen, this method gives a '403 Forbidden' error. I have tried making the sig.php & av.php files executable to 'world' (chmod 755), but I am still receiving this error.

Is there anyway that I can get this functionality back with WoWRosterDF & SigGen? I really don't want to have to save the images on the server.

Only with mod_rewrite
DF restricts direct access to any php file other than index.php or admin.php

"mod_rewrite" means :
Put this (or, edit yours - toy with it) in your .htaccess file in your root web server directory :

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SetEnv REGISTER_GLOBALS 0
SetEnv ZEND_OPTIMIZER 1
SetEnv MAGIC_QUOTES 1
SetEnv PHP_VER 5
Options +FollowSymlinks
RewriteEngine On
RewriteBase /
RewriteRule ^/?roster/addons/siggen/(sig|av)/(.*).png$ ./roster/addons/siggen/$1.php?name=$2&saveonly=0

Let go by it one by one:
SetEnv REGISTER_GLOBALS 0
SetEnv ZEND_OPTIMIZER 1
SetEnv MAGIC_QUOTES 1
SetEnv PHP_VER 5
Options +FollowSymlinks
These are the commands that:
Don't bother : I need these for my server - please understand that there are 3 trillion types of apache web servers on this planet - and every hoster use a "different one" - go figure. Maybay because otherwise things would be easy, and site admins would be without a job very soon.
[ok, SetEnv PHP_VER 5 means : use PHP version 5 - because default it will be version 4 for my hoster ]

RewriteEngine On
RewriteBase /
RewriteRule ^/?roster/addons/siggen/(sig|av)/(.*).png$ ./roster/addons/siggen/$1.php?name=$2&saveonly=0
Now where at it.
First line : this must be logic, if not : go Google.
Second line : I NEED this, you meaby not. If not, it will not bother you when you put it in there.
Third : now we are there at last :
Just copy this one !
Please note that MY roster directory is in a directory named .... /roster (Smart thing, no ?)
Another might be exception : the line starts with "RewriteRule ^/?....
You might not be needing the "/?" part. I need it (I'm at www.ovh.fr...). I struggled for 1 week to find this 'small' issue, but found my answer on the hosters forum .... (hosters always have a forum/wiki/FAQ/hotline/manual/blogs/..... where members / renter of sites can yell and scream WHY things are different on their hoster , because it's 'different' on another hoster.
Please note that this is not an univeral .htaccess file : this one worked for me. Yours, of cours, will be (great chance) different ! Welcome to the club

Please note that toying with an .htaccess file can have very nice and very bad side effect for your site.
Seeing statement that you don't understand 'well' : My God, go Google !!!

A small test ?

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http://www.papy-team.fr/roster/addons/siggen/sig/Nowwhat.png

Gives back:

Please note that I have a .../www/roster/addons/siggen/sig directory -but I deleted the Nowwhat.png file just 5 minutes ago ...

Also : I use PNG file, you could also generate a JPG file - just stick to what you choosed in the admin section of siggen.

&saveonly=0 means : don't save the file (for later - faster use) when generated.

PS : Nowwhat == "tuigii"