I'm sorry for the bump but I was told I can bump as long as I contribute to the topic. So I decided to write a review for the mod which I played in past couple of weeks when I had some free time:
I enjoyed playing the demo. All 4 missions are well done and I didn't find them too difficult (I only failed second and third mission once, while first and fourth I did in first try). They are fine in terms of difficulty and length. Like I said, I failed second mission once because I got caught by the mafia in that narrow street before I got to the main road (to be more exact, before I reached the cement truck) but in second time I had no problem with avoiding all of that, while the third mission I failed because I was seen by the driver when I tried to sneak from behind the truck, so then I tried a different angle to approach which worked. For people who may have a problem here, I recommend going around the Try-N-Save and then rush to the back of the truck and you should do the objective fine. I suppose these types of ASF objectives can be tricky because it leaves no room for mistakes, meaning if you fail, you have to redo the mission from beginning, which can be irritating if it's a difficult and/or long mission. Thankfully it's not really the case here.
In last mission where I destroyed Mayor Quimby's car, on way driving to the Police Station, I was expecting for an extra "avoid mafia" type of objective just before reaching the final objective but there wasn't, so it's better it ended without this objective, at least for now. Maybe there will be in final version, maybe in a future mission, who knows? Just a minor suggestion unless the missions are already done.
Now to reply to what 97Meter suggested:
For the clue, I personally didn't have any trouble finding it, so if anyone has trouble finding that clue, I can only spoil a little bit:
Spoiler
Look near Police Station
The Road Rage music was ok to me. I don't mind it and it's nice to have a different song once in a while. I know there have been at least 2 mods that used it for the level driving song and I think it's pretty cool. It can get annoying and repetitive after a while but I still like it as a variation from time to time.
The races and clothes are indeed not working at the moment. I also find annoying where I play a mod and when I try to talk to the people who host the races or bonus missions or selling vehicles and the game crashes. It's not usually a problem because I save the game often (and use several slots, one per each mission, since saves are stored separately per each mod). Since this is just a demo, I am not complaining about this. But I just wish that when mods get released in final state, they don't have this problem with the non-existing races or the bonus mission not working or other glitches that affect the level completion, because for example in the other cop-related mod, Homer the Detective, I didn't like how two of races didn't work, so I couldn't even unlock the last vehicle and in turn, not being able to complete level 100% because of these minor glitches.
Back to Cops in Springfield, I really hope the final version of mod to be as polished as Storm Over Springfield was. It is my favorite mod released so far (from all the mods I have played so far, I didn't play yet most mods released this year or some that got released last year, I will try to play them eventually, when I have more free time) as it had everything well done and the whole level could be 100% completed too. I don't remember having any issues with SOS, if there were any issues, they were probably very minor and didn't affect the experience of mod at all. So I hope CIS will be just as good as SOS was.
The only remaining suggestions I can give at the moment for the final version is to make the font light blue, to better suit the theme of the mod. And try to also look into the glitch that causes the Hit & Run meter to be restored upon entering and exiting an interior. The same glitch that happened in Homer the Detective. It's not that big of a deal because I think during missions, the Hit & Run meter gets disabled anyway, so this only affects free roaming if you want to get all the collectibles before starting missions, which is what I usually do with every mod.
Overall, the demo was really good and I'm looking forward to the final product.