mhonarc 2.1.0 & thread movement

The $T{NEXT,PREV}MSG$ resources move to the next/prev message in a
thread, or to the next/prev thread if at the end of a thread.  This is
good.  But additionally, our users would find it helpful to be able to
jump from the middle of a thread to the next thread.

I looked briefly at the code and didn't see any obvious way to do this.
Seems like another array of pointers parallel to Index2TLoc etc. would
need to be maintained?

Any suggestions appreciated.  Thanks.

karlb(_at_)atg(_dot_)com