It would be cool to add these two vehicles (SWAT Tank and FBI Truck) ingame. It's a shame they're used only on missions (FBI Truck is used only on TTDISA, for example). If you could make them available ingame it would be just great - but without replacing Enforcer or FBI Rancher. Could you please make that?
What exactly do you want?
1) Without replacing a dff and txd (modeling files) or
2) Without replacing a car via coding way?
Do you mean like adding some other car to the wanted level without touching the existed cars (like 2 vehicles at 5th or 4th star at once)?
Well, my idea was always this: ADD the SWAT Tank and FBI Truck to the game. Originally, SWAT uses the Enforcer, and FBI the FBI Rancher. But my idea was to make SWAT and FBI use these vehicles without replacing the original ones. For example: SWAT appears ingame with a 3 wanted level, using the Enforcer. You could make SWAT use the SWAT Tank when the player reaches a 4 wanted level; FBI appears ingame with the 5 wanted level, using the FBI Rancher; You could make them appear using the FBI Truck on the 6 level wanted. Resuming: SWAT and FBI keep normal at 3 and 5 wanted levels, with the Enforcer and FBI Rancher; SWAT will use the SWAT Tank on the 5 wanted level and FBI will use the FBI Truck on the 6 wanted level. You could do this trick via coding - without models replacement. Another good idea would be have these vehicles parked on the police stations. Did you understand me? I don't know if I explained it very well...
My idea for the next (different) script: Make the law enforcement to be varied when dispatching. So for example in the original game, only the army will be dispatched to come after you (not counting on-foot cops & helicopters) at 6 stars. My idea is to make it so that SWAT teams, FBI agents and normal officers are still involved coming after you at 6 stars. You could make the army, SWAT, FBI and normal officers to have .25% chance each of being dispatched so that they'd have equal amount of chance of being dispatched. The same idea applies when you have 5 stars -- but FBI, SWAT teams and normal officers would have .33% chance of being dispatched. I hope I explained it well, if not tell me the confusing parts p" />
I'm making some universal wanted level mod - which will add more vehicles (the police, SWAT, FBI, ARMY and maybe more personel will driving it).
About your idea - I don't understand do you want just vehicles or just foot cops to be merged into one single WL star (or both)?
1) maybe add one more unused car for undercover cops? Separate cleo cs file ofcourse so users could have a choice
2) Also, could you merge the next version with police weapons mod?
1) Black rancher from the 3rd star was originaly thought to be cheetah as undercover. And I left a source codes inside a mod - it's easy to modify them (I'll put the instructions in the next version).
2) v1.2 - yes. v1.1 - not likely - the code is massive and I don't have the time for it :/.