The stable version is ancient, I would just update the existing package.

@jtojnar I am not sure whether this makes sense to replace a stable version with a beta. I even made sure to replace the target binary to be "vokoscreen-beta" in order to enable having both versions, stable and beta, installed. I agree that the stable is ancient and I can tell that I successfully used the beta a few times now, but from a conceptional point of view I would still disagree 😅
or do you think having both is problematic somehow?

A beta package increases the maintenance costs, especially keeping the two expressions in sync.

Is there any reason why someone would need the old version (e.g. removed functionality)? In practice, we often see that while a release was not yet labelled stable, it is actually more stable than the most recent stable build, thanks to newly added bug fixes. For that reason, many packages in nixpkgs often use “unstable” releases or even VCS snapshots.

But really, it needs to be judged on case by case basis. If the beta introduces more bugs than it fixes then parallel expression would be justified. In that case both expressions should share a directory and perhaps inherit from single common expression.

@jtojnar well okay, I will make a new pr that upgrades the stable to the beta 😉