The only free option I know of would be to use the Morph tool in AC16 but if your restricted to AC13 then its not an option.
I have a joinery tool that was built in AC13, gives you flexible style options and it is quite inexpensive at $48 with no ongoing costs for upgrades or compatibility. You can view the demo clip here:
http://cadswift.com.au/products/Swift-Joinery.html
I will be improving this object next month so if you let me know what you need I can do it for free (once you have purchased the object).
Apart from that you could copy out the object your using and then spend some time defining new styles in the script. Though this will take some time, the script should be easy you just need to find the panel aspect.
Creator of Cadswift's parametric GDL libraries
Creator of Infinite Openings and Component Catalogues
Push the envelope & watch it bend
website:
https://cadswift.com.au/
YouTube:
https://www.youtube.com/user/CADSwift/playlists