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Distance selection Mode :
Select point around the existing point selection

Starting shape
Select some points
Run Custom Select , and choose "Distance"
All points in the given distance are selected
If you select separated groups
the 'center' of all groups is used as center of the selection...

I'll try to add a better code later to keep groups separated, and then simulate a "growing" selection
[EDIT] : Since version 1.5.8, the growing selection is in place