triggering translation from engraver

[Jan-Peter Voigt]

Hi developers,

I have difficulties to find the right words for this question, but I'll try:

The edition-engraver comes into action, when it finds a mod 
(tweak/override) for the current spot in time, that is measure/barNumber 
and moment/measurePosition. These mods are applied in one of the 
engravers slots, that is either (most times) in the 
start-translation-timestep, acknowledger, listener or the process-music 
function.
Now, if there is no stop/break in translation the function will not get 
called:
\editionMod target 1 1/8 Voice \override ...
will not get called if the music is something like
{ c'4 c' }
because after step 0/4 step 1/4 will get called, but not the 1/8 step.
(I hope you can follow)

There are two things I'd like to accomplish:
1. allow the edition-engraver to apply tweaks outside the regular 
"stops" of the music
2. add an offset to a mod and apply the tweak a given moment after the 
current time

To do that I would like to trigger/broadcast an event that forces the 
translator to stop again after a given moment has passed. The former 
example will work if I add some skips to the music:
<< { c'4 c' } { s8 s s s } >>

But in my tests broadcasting a skip-event didn't show the desired 
effect. Maybe I did something wrong or maybe this is the wrong way.

Do you have another idea how to do that?

TIA
Jan-Peter