Yes works fine in V 4.0 ;)
Draw some Objects + a point at the same place/object for a regular result : with the Array / Dir for example...
Deselect all
call the plugin
Select all (objects + points)
Click Start - End first Step (here 2 unities) so gap result will be here 2 4 6 8
et voilĂ :)
Ok, it seems to work now... The only issue I found is that it only works once. So if after getting the result from shiftarray I undo the command I cannot repeat shiftarray unless I do a new array. Is that normal?