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When I ⌥ AltLMB LMB on a transformations property, I can change multiple the property for multiple object with once input action. The property turns blue for the duration of the operation.

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Is there a way to make this work for custom properties?

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    $\begingroup$ While it is possible to use "Alt"+LMB on values like rotation, you can also use the right-click menu and "Copy to selected" or it's variations like "Copy to all selected" and "Copy single to selected" while the first is easy to understand the latter i didn't yet figure out the difference of. That said, the custom property value does not have that option of "Copy to selected", thus i believe there is a differentiation inside Blender that may as well be reason why the "Alt"+LMB combination is not working there. $\endgroup$ – Xylvier Nov 20 '19 at 16:36
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I don't believe it's possible by selecting both of the object. For a simple reason, one of the object may not have the property.

If you want to change multiple property at once you can add a driver between the property of the two (or many) objects.

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    $\begingroup$ You can change mesh or lamp specific properties for example even if other object types are selected though $\endgroup$ – Duarte Farrajota Ramos♦ Aug 15 '17 at 3:08
  • $\begingroup$ @DuarteFarrajotaRamos How are mesh or lamp specific properties the same as user defined custom properties on an object? $\endgroup$ – Gordon Brinkmann Nov 30 '20 at 14:06
  • $\begingroup$ They are the same regarding the possibility of different objects having them or not. That may not be the reason you can't mass edit them with Alt key, probably just that the properties are not "the same" despite sharing a name. $\endgroup$ – Duarte Farrajota Ramos♦ Nov 30 '20 at 18:34
  • $\begingroup$ But that's the exact point that the answer is all about. When you select multiple objects, and some are let's say point lamps and some are UV spheres. If you edit the power of the light source with the Alt key, than the value changes for all the point lamps although you also have UV spheres selected. Because these are object specific properties and Blender knows, all point lamps have these properties so it can change them on all objects of the same kind. The custom properties are defined on a certain object and there is no default setting for other objects (if the object data is not linked). $\endgroup$ – Gordon Brinkmann Nov 30 '20 at 22:13

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