This extension consists of two custom LightSwitch business types:
Percent Type
To use the Percent business type, you can select it for any decimal property.
the suggested scale is 5 (to be able to store 3 digits, & the decimals places)
the suggested precision is 4 (to be able to store percentage values of up to 2 decimal places)
ISBN Type
To use the ISBN business type (my thanks to Andrew Coates for providing the basic workings), select it for any string property. You can choose to allow:
ISBN-10 (9 digits, followed by a check digit that is either a another digit, or an X)
ISBN-13 (13 digits, the last of which is a check digit)
Password type
hides the characters being typed
validates several optional conditions
Link type
allows you to enter/edit a URL
launches a browser