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You are pretty much restricted to four things to kick them off:
1. A scheduled call to the service - You can set this when you build the service
2. A Quick action
3. A workflow (by calling the quickaction)
4. A triggered business rule, but you need the RecID of the webservice you are using. You can use the "Clone from another Action" to get the ID after you make a quickaction for it.
Your insight is well appreciated.
I am sure you will agree with me though that having this feature will be beneficial to all. So I have made a feature request to iVanti in the following link:
I encourage everyone who reads this post to visit the link above, and vote for this feature request, in hope that the request will be adopted/approved.