The main problem you have here is that you are stacking one router behind another.  Even if you only want it for wireless access, bear in mind that its still a router and you are stacking it behind your 2wire gateway, which is by definition another router.

The problem lies with IP adressing, specifically public vs. private IP addressing.  Your gateway is showing the world your public IP address.  It solves the problem of differentiating multiple devices on your LAN (Local Area Network) by assigning each device a private IP address, (normally 129.168.X.X).  The problem is that your Linksys router wants to do exactly the same thing.  It will see that its being assigned an IP address starting 192.168.X.X as its public IP address and that will cause a conflict with its own private IP addressing scheme.  Long story short, nothing works right after it is connected (either wired or wirelessly) to the Linksys router. 

There are a couple of solutions available and a couple of problems that can be caused by trying them out.  First, you can try to disable all of the Linksys routing functions and simply use it as an unmanaged (open) switch and WAP.  You should turn off your gateway's wifi capability if you plan on doing this, otherwise you could be inviting another resource conflict between the two devices.  The other solution is to change your gateway's IP addressing scheme to one that uses octets other than the 192.168.X.X that your router will need to use. In this case each device may actually see the other as a separate wifi network, although I'm not exactly sure if it would work in this case (memory is a little fuzzy on this point).

One of the biggest concerns with stacking routers in a Uverse installation is pixellation and picture freezing issues on the TV's.  Even though you dont think of them as being necessarily related, they are in fact related components (TV and Internet) in a Uverse system.  The additional router can, under the right circumstances, cause some packet scattering in your LAN which will cause pixellation and freezing on your TV's.  Pair that with the fact that very few tier 2 techs are saavy enough to support it and even fewer prem techs are saavy enough to install it.  You would probably end up being on your own if you ever had any problems with it. 

Honestly I would recommend that you steer clear of stacking your routers.  I am an A+ certified PC technician (and have been for many years before I ever started working with Uverse) and I would think two or three times before doing this myself, much less recommending it to someone else.  Bottom line is this:  Yes it can be done but you had better know what your doing before you try it.

Regards in router stacking madness

Dave