Hello this MEL script selects every other "number" of edge loops or rings via a pop up.
Select your first edge loop or ring, execute the script and enter your value. You can then create a shelf button, add it to a hotkey or both.
Enjoy
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string $result = `promptDialog
-title "Select Every N Edge Rings"
-message "Every N rings:"
-button "Select"
-button "Cancel"
-defaultButton "Select"
-cancelButton "Cancel"
-dismissString "Cancel"
-text "3"
`;
if ($result == "Select")
{
string $value = `promptDialog -query -text`;
int $n = (int)$value;
if ($n > 0)
{
polySelectEdgesEveryN "edgeRing" $n;
}
else
{
warning "Please enter a number greater than 0.";
}
}