"anchors" in the music stream?

[Kieren MacMillan]

Hello all,

Like many Lilyponders, I break down my code into variables, e.g.  
global (for time signature changes, etc.), notes, dynamics, etc. The  
main irritation with this (IMO) is that each variable requires a  
complete set of skips in order to keep the timing accurate.

Would it be technically feasible/possible to establish a system of  
"anchors" instead? That is, could we declare an anchor point in the  
global setup, and then refer to it in other code? e.g.

global =
{
  \time 4/4 s4*4*10
  \time 3/4 s4*3*5
  \time 7/4 s4*7
  \time 4/4 \anchor #'coda s4*4*10
  \bar "|."
}

tempoChanges =
{
  \tempo \markup "Opening tempo"
  \anchorTo #'coda \tempo \markup "Extremely slow"
}

??

Just a brainstorm from someone who doesn't understand the internals  
enough to immediately see the stupidity of this idea...  =)

Thanks,
Kieren.