Mein Vorschlag: englischer Originalbegriff mit Erklärung in Klammern oder umgekehrt

(begleitende) Gesten und Handlungen des Schauspielers

oder:
Bühnenanweisungen für den Schauspiler (but that's not so specific)

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http://olympia.osd.wednet.edu/media/olympia/activities/drama...
Stage business refers to the gestures and activities an actor performs as part of a
scene on stage. While blocking refers to the large movements -- crossing the
stage, sitting, standing -- business refers to the smaller things -- combing hair,
sipping tea, tapping pencil, etc.
There are two types of Stage Business that are used in scenes. They are called
necessary and interpretive actions.
Necessary actions are actions that are called for or referred to in the script. For
example, if a character says “Just a second, Iʼm putting on my lipstick”, we know
that the character needs to be putting on lipstick in that scene. Lines such as
“This cookie tastes stale” tell the actor to take a bite of the cookie before that line.


http://www.thefreedictionary.com/stage business
stage business - incidental activity performed by an actor for dramatic effect; "his business with the cane was hilarious"

http://tinyurl.com/zukfgb9
stage business - Bühnenanweisungen

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Note added at 1 day4 hrs (2017-02-18 04:29:41 GMT)
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oder auch:

begleitende Gesten und schauspielerische Handlungen

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Note added at 1 day4 hrs (2017-02-18 04:35:03 GMT)
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PS: immer mit "begleitende"; das Wort ist wichtig.