Assuming there are many hashlists which have a similar naming pattern (incremental numbers, uuid indentifiers, etc).

When creating a 'New task' via /hashtopolis/tasks.php page is very difficult to select the proper hashlist, since the input field is lacking filtering/sorting.

It feels more natural to have an action button at 'Hashlist details' /hashtopolis/hashlists.php page which presents the 'New task' page with the proper hashlist pre-selected. Example: