pocoMC is developed and maintained in my spare time and, while I try to be responsive, I don't always get to every issue immediately.
Ensure the bug was not already reported by searching on GitHub under Issues. If you're unable to find an open issue addressing the problem, open a new one. Be sure to include a title and clear description, as much relevant information as possible, and the simplest possible code sample demonstrating the expected behavior that is not occurring.
Open a new GitHub pull request with the patch. Ensure the PR description clearly describes the problem and solution. Include the relevant issue number if applicable.
First, open a new issue and clearly describe your idea. We will then let you know if what you suggest aligns with the vision of pocoMC. This way you might avoid doing unnecessary work and might even find some help from other people.
Cheers,
Minas