The idea with Cannis' Assault game mode [
www.cannis.net/assaultmaps] is that you can adapt your mod to include that game mode and support the Assault map packs. You can choose most of the properties for the flag structure yourself.
Assault is a 'destroy the flag' mode rather than capture.
If you want to try the Assault mode out without downloading a huge mod or implementing it in your own, get the YR Unofficial 1.002 Mini-Patch from marshall.cannis.net, and at least one of the two map packs from
www.cannis.net/assaultmaps