Every since Dying Light came out, mods have been a pretty contentious issue. There have been DMCA strikes on YouTube users uploading gameplay featuring mods and one of the updates for the game made modding much more complicated.
Eventually, Techland claimed this was all a misunderstanding and today they've taken steps to rectify the issue. In a press release, the developer announced that modding tools would be coming to the game and that it would continue to actively support that community.
The release stated:
As a sandbox game, Dying Light is a perfect material for modding.This is why we are currently working on free and extensive modding tools for the game. And we want players to tell what they would like to see… We're inviting all Dying Light players to visit our official discussion board and share their mod ideas – no matter how crazy – with us here.
After the modding tools are released, we plan to actively support the coolest mods created by players
I really do hope the developer supports the modding community, rather than dictates it. I understand there are some online components which could make cheating tricky, but the community should be able to make largely what they want, and players should be allowed to mod as they want. I could see this turning ugly if not.