Almost fell off my chair when i couldn't find the raido or checkbox's but i get it, lots to do. Will embed code for now.
Reasoning why its important:
When you have a set number of options you can show on the screen at once, e.g. multiple choice, you get a higher fill rate than it being hidden away in a select box.
And then if your using select box's for diverse options like country field, then using a "http://silviomoreto.github.io/bootstrap-select/" Select Search feature is preferred so you can quickly get to the option.
Last thought when you add check box's and radio groups, if you can make it customisable similar to the select box's e.g so you can have a touch friendly 40px radio button. that would be ideal. as the regular tick and radio is not as friendly on mobile.
For myself building Software User Interfaces instead of marketing sites, Forms are the bread and butter. Keen to see this evolve.