I think you could use a physical skill like that, however it might be limited by a social skill as you maintain your side of the conversation. Perhaps rapport to keep the small talk up or something. Alternatively, if you want to use just deceit both for the distracting conversation AND for the minor adjustment then perhaps you could do the conversation as a supplemental action and take a -1 for the main action.
For the original combat example, rather than use the 'oblivious' aspect to get a +2/re-roll, you could use it to say that they obliviously walk right past you without noticing and carry on with their own business. Could be useful if you want to follow that person.
Could you also use it to declare another aspect like 'downwind' on the scene which you could tag for an additional +2 (using a fate point to compel the previously tagged 'oblivious' for a +4 in total). Or could you declare an aspect like 'not expecting trouble' on the target for a similar result?
Also, you could probably use it for an assessment roll, watching them as they walk obliviously to learn about a weak point or similar.
