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I don't think using the -ing form in a manual for a Dutch audience will
cause any trouble, because such constructions are used in Dutch too. E.g.
"Formulering van een hypothese" means "Formulating a hypothesis".
A search for "simplified english", "global english" or "ESL" in the Techwr-L
archives will give you quite a lot of information on how to write
understandable texts for non-native speakers of English. Also, feel free to
mail me off list if you have any more specific questions about Dutch
Have a nice day,
Mediasystemen, a Triple P company