Selecting points in material editor

Is there a means of selecting several points (but not all) to adjust their positions in the material editor. Normally this can be done in the programme by Ctrl+LMB but it does not work for me in the editor. An alternative would be to provide a selection box. I have found that minor adjustments are often necessary to the position of several points which, to avoid distortion, need to be moved together. For this, the scale function is not useful. Another problem I have found is that it can be difficult to get an individual point to move to a specific position as the minimum movement of a point when you drag it is too large. Finally, though I realize that this could probably only be done in a completely new version, would it be possible to have a greater zoom factor when editing materials?

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