Ok, there are several issues here:
1) don't edit files in 'default' folders, edit in 'local' instead.
2) the file is called transforms.conf not transform.conf (but maybe that's just a typo)
3) in order to activate a transform, it has to be invoked from props.conf ;
props.conf
[your host, source or sourcetype]
TRANSFORMS-blah = setArkoon
transforms.conf
[setArkoon]
your REGEX, FORMAT, and DEST_KEY here (which look ok, by the way)
Also, out of habit I always recommend that you use underscores instead of hyphens in names. Splunk is picky sometimes.
4) depending on how you get your data in, it might be possible to set the sourcetype in inputs.conf. You should look that up.
5) As you've noticed, you base your field extractions on sourcetype (which is A Good Thing), so basically, the format of the events should dictate what calls for a new sourcetype. Don't overdo it, e.g. create sourcetypes like arkoon_fw1, arkoon_fw2 etc, if the actual log format is the same.
Hope this helps,
/K
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