accidental-style modern

[Michael Kiermaier]

In the accidental-style modern, accidentals get cancelled in the following 
measure.

I would like to extend that behaviour to the next two or maybe three or four 
measures, since the measures are relative short in my case (3/8 time 
signature). Is that possible?


What I mean is:

If I have
\relative c' { \time 3/8 \key g \major f4. a4. fis4.}

I want to have the sharp sign for the fis in the third measure, because two 
measures before there was a f.


I know how to force lilypond manually by the ! sign, but I really want it to 
be done automatically.


Thanks,

~Michael