I understand you can disable the global setting to automatically Scale Toolbar button images when larger than standard size.
- What is the "standard size" (or maximum size) toolbar button image before scaling occurs (e.g. 128x128, 32x32)?
- Is possible to set the toolbar auto-scale on a per toolbar basis?
The current sizes of your icon sets are listed under Preferences / Toolbars / Icons.
Standard "small" size is 24x24 multiplied by the system DPI.
Standard "large" size is 32x32 multiplied by the system DPI.
But those are just the sizes used by the default, internal icon set. You can use whatever sizes you want when making your own icon sets, and you can also specify how (or even if) they are DPI scaled.