vertical placement of \mark

[Graham Percival]

A short time ago, the vertical placement of \mark was changed so that
it was placed above any other notation in the system.  In other words,
the "mark" in the example below was a huge distance above the staff.

\version "2.7.5"
{ c'1^1^2^3^4^5 \mark "mark" c'1 }


Shortly before 2.7.5 was released, this behavior (which presumably was
a bug) reverted back to the old version -- the "mark" is printed right 
above
the staff lines.

Even though this was a bug, I found it *extremely* useful.  Could the 
"above
the system" vertical positioning (instead of "immediately above the 
staff lines"
be made into a tweakable option?

Cheers,
- Graham