General things to do (in no particular order):

Rework Chapel FEB support to use new task-queue system.
Rework most qutil/qloop functions to deal with deactivated shepherds.
Implement periodic task system.
Implement direct thread swapping, esp. for sinc's or other synchronization operations where the next thread to execute is obvious.
Add a qthread_replace(me, func, arg, argsize) function to enable convenient tail-recursion algorithms.
Implement Qthreads with in/out vectors for cross-node workstealing.
Implement 128-bit syncvars.
Implement cross-node synchronization (i.e. fill remote FEB).
Implement hierarchical shepherds (need to rename shepherds).
Add support for "spawn_to" information in the precondition record.

General things to think about:

Refactor code base to provide a proper qthread.hpp for including in C++ applications, in place of the (clever) C++ support in qthread.h.
Implementing MAMA malloc.
Coalescing system calls.
Non-executing shepherds to allow for memory locales without associated computing resources.
Porting to XMT.