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This Modeler tool allows you to move, scale and rotate the selected UVs in the UV view. UVs can also be fit to a section of the UV space.
You can press 'n' to open the numeric panel which contains the following controls:
The centre position of the UVs.
The size of the UVs as a percentage of the original selection.
The rotation of the UVs.
Snaps all interactions in the viewport to the grid as provided by Modeler. Unfortunately this grid has very tiny steps.
This is the plugin of the month for June 2020, made possible by the finest patrons on Patreon.