As the topic states here, I saw that the options you have are currently boolean combinations of the above 4 features, but don't cover all the combinations (16 ). Best way to implement this would be to separate them into smaller subfilters and let them combine at the end.

Completely scanlated has its own boolean value
Completed has its own value which excludes ongoing hiatus and discontinued from its checks while looking for complete in the status value
Oneshots has its own keyword check in the status value
At least one has its own check

Just taking boolean AND of all these subfilters at the end would allow better filtering in terms of completion status,
Would also provide better control for users

You can do that via the API now. We added a new filters option a few weeks back. However, we haven't modified the UI significantly. We are focused on some other things at the moment.

I was actually requesting it for normal viewers, which can only be possible through the UI 😢

I wish for "incomplete" search option on site 😢 sometimes series got for example side afterstories but currently I can't search for only incomplete series