Carsten et al.,

Okay, I've tried following the instructions for submitting patches.
I've learned more git than I thought I needed the past few days... ;-) 

Anyway, I've uploaded my changes to

git://github.com/ericsfraga/esf-org.git

under branch "icalalarm" assuming I've done things correctly.  Please
do let me know if I should have done anything differently.

The changes are to allow timed events exported with an alarm reminder
if the variable org-icalendar-alarm-time is non-zero (defaults to 0 so
that default behaviour remains as it was before).

Thanks,
eric