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It's much more complicated because you have to do everything yourself so if you can't figure out Strife's dialogs you might have even less success with ACS.
It's certainly possible, as Graf said, however it is a long process, and the scripting can look huge and confusing pretty quick (trust me on that one).
switch cases and print statements would do the trick, however it won't be a visually exciting design. My advice is to learn how to use strifes dialog system
The only part you wouldn't be able to do with scripting is matching each choice up with a number. Other than that, it wouldn't be too hard to do an acs conversation script.
RTC-3057 had a command console-type thing, but the ACS wasn't included in the file. I do know DECORATE and ACS however, and I also know how you can bind aliases to specific console commands and blahblahblah in KEYCONF. The only thing I'm having problems learning is Strife Dialogue scripts.
Sorry for bad English...
(Quesion for 3rd post - Phobus's post)
If it's confusing pretty quick, is it possible to upgrade the Strife dialog system? For example: I want to open doors, change thing's properties after dialog with one of DECORATE-humans.
Well, I imagine the Strife dialog system may be easier to work with, but I don't know anything about it, so I played it safe and made my own ACS system. I understand it, but that's because I wrote it, others may not be able to work it out.