Leaflet's zoom control only goes +/- one level at a time. This add-on lets you zoom five levels at a time. Try it out in this sample map:
The control is written to be mostly independent of other files, so you can easily drop it into any Leaflet map. Start by loading the code into your HTML file:
<script src="//acme.com/javascript/acme.namespace.jsm" type="text/javascript"></script> <script src="//acme.com/javascript/acme.maps.zoom5.jsm" type="text/javascript"></script>
If you want to copy the code to your own site that's fine - trade-off between depending on me vs. getting any bugfixes.
Step two, add the control to your map.
acme.maps.zoom5.Create( options ).addTo( map );
That's all there is to it.
ACME Labs / JavaScript Utilities / Zoom Control