TimeSignature: small gap between denominator and third line of the stave

[Werner]

Hello.

If you use 4/4 instead of C via
\override Staff.TimeSignature #'style = #'()
the cyphers are „huge“ and merge at the third (middle) line of the stave.
When you add
\override Staff.TimeSignature #'font-size = #-1
to optain smaller cyphers, there doesn't appear a gap between them, but they
merge still in the middle of the stave.
(Try 
\override Staff.TimeSignature #'font-size = #-3
to see a really ugly example.)

Mats Bengtson provided the following solution (see lilypond-users-list, 
http://thread.gmane.org/gmane.comp.gnu.lilypond.general/35131)

 % Markup to produce a 4/4 time signature that works with smaller
 % digits and a small gap in between. 
 tsMarkup = \markup {
  \vcenter \override #'(baseline-skip . 2) \number {
    \column { "4" "4" }
  }
 }
 % example
 \relative c' {
    \clef G
    \key g \major
 % % 4/4 instead of C
 % \override Staff.TimeSignature #'style = #'()
   \override Staff.TimeSignature #'stencil =
      #ly:text-interface::print
   \override Staff.TimeSignature #'text = #tsMarkup
    \override Staff.TimeSignature #'font-size = #-1
    \time 4/4
    \partial 8     d'8 | % Auftakt
 }

I would prefer 
both ciphers (vertically) centered in the upper and lower half of
the stave respectively (means the numerator between the third and fifth line of
the stave, the denominator between the first and third line) 
or
the denominator standing on the first line and the numerator on the third line
of the stave
or
at least (and maybe necessary for drums/percussion-staves wih just one line) a
small gap between the top of the denumerator-cypher and the middle line of the
stave an thus the bottom of the numerator-cypher
by default.

I consulted some of my (especially older) (only german) music books and I found,
that maybe more often the cyphers of the Time Signature merge with the third
(middle) line in the stave an with each other, BUT there are really many
examples, that there is a small gap between the top of the lower cypher
(denominator) an the third line and also between the top of the numerator (upper
cypher) and the fifth (upper) line in the stave too. 
It seems, the merging appears, but isn't really what the engraver wants...
(And it's not what I want.)

Could you imagine to change the default-behaviour?

Greetings

Werner