Hello
I am Tanveer Arif and I am currently a Firmware Engineer. I have working knowledge on OpenWRT (Backfire, Attitude Adjustment, and Barrier Breaker) and I have been developing firmware for Atheros and Realtek based APs and routers. I believe you want to add a package ser2net in LuCI which is by default not present in LuCI. I have done this before but the package that I wanted to include was Coova Chilli. The package that as available as a patch did not have enough options and was not working so I manually configured the patch and created a script that acted as a bridge between the broken coova-chilli luci package and OpenWRT kernel. Customizing the LuCI web interface is not an easy task as it includes modification in lua language, styling, and java script. I am 100% positive that I can do this. If you want samples of what I have been working on this I will gladly share with you. I would prefer you tell me the details how you want your LuCI page to look like and I will get it done. If you want to do it yourself, I will tell you change in which files will result in which output but I will not guarantee anything beyond that because LuCI uses combination of HTML, Lua and Javascript and that requires a lot of work. My recent works with OpenWRT include captive portal configuration, RADIUS server implementation on linux machine as well as OpenWRT.
Hope to hear from you soon
Tanveer.