If you ever need a custom work list and need to open the human task from this list, then this blog can help you. All you really need to do is find the list of tasks and create the URL that opens the task from the custom work list. This is not as straightforward as it seems since the URL contains some dynamic fields that you will need to derive from information about the tasks.
The need for a custom work list usually involves some sort of relationship between instances in a process, or between tasks in different processes such that the OOTB functionality of the BPM workspace is not sufficient. The user wants to see a logical grouping of tasks or between parent and child tasks. These tasks should be shown grouped together. These tasks can be shown in a table or tree format and each task should have a link to click on to open the task directly from the form. This is an example of such a list and grouping. Read the complete article here.
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