While I don't use scents and sprays much, I think there are some improvements that could be made.
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Add a timer to display how long the spray lasts similar to Scent Eliminator
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After doing some tests, the stats don't change when putting skill points into range, duration, attraction strength, etc and there's nothing to see on the map or huntermate either indicating these improvements are in effect. (The numbers should increase in the stats like how you can see the change in store costs going down when the Haggle skill is selected)
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Maybe have a slightly visible cloud show in front of you when it's used to show the width and direction of the spray (similar to Classic's wind spray). This is debatable and problematic because it could reduce the effectiveness of adding points into and using Wind Prediction skill (if it's even used anyway)