To me it makes more sense to control the charging rate on the EVSE rather than the EV, since it is the EVSE that communicates to the EV what the max charging amps is in the first place.
If I had a 2013 Leaf w/ the 6.6kW on-board charger (instead of my 2011) I would normally only care to be able to adjust the charging rate via my home EVSE (currently a Blink) which I think would be a lot more convenient rather than a Leaf setting. I would change the default charging current from 30a to 16a (I almost always charge to 80%, and it rarely charges more than 3 hr), and if allowed only rarely bump it to something higher (probably 30a) when I was in a hurry. Charging away from a home EVSE I would normally want the maximum charging rate for that Level 2 EVSE (the Leaf will never try to draw more current than it can handle), so that someone else could more quickly use that EVSE when my Leaf finished (and to reduce any charging costs to me based on time).
What are the available amp settings on the residential Blink? Is it 12a, 16a, 24a, and 30a as mentioned in the Blink Installation Manual specifications?
For safety reasons I do not recommend anyone routinely changing their Blink's "Installation Max Amps Input" via a password they shouldn't have access to! I would not be surprised if Ecotality enhances their Blink software to allow a "User Selected Max Amps Input" (but allowing no higher than the "Installation Max Amps Input" set for the installation circuit specifically for safety), but if they don't a default 16a "Installation Max Amps Input" setting seems a good compromise that some 2013 Leaf owners may wish to consider.