A two-foot strip can be used to emulate mending.
1/3rd of a roll can be used to emulate make whole.
An entire roll can be converted into the equivalent of a tanglefoot bag in 1d3 rounds with a DC10 Dexterity check. Failure by 5 or more applies the effect of the tanglefoot bag to yourself.
Four rolls, thrown into an area that is then subjected to a fireball, will 'cook off' and create a web effect within the spell radius.
Using duct tape when making Craft checks to create or mend an item adds a +2 bonus to your checks. A full roll has 50 uses' worth of tape in this application.
Warforged and other constructs may use duct tape to repair damage to themselves. Each application requires 5 minutes' work, provides healing equivalent to a repair light damage spell using their character level as the caster level, and expends 1/10th of a roll.
1/10th of a roll may also be used to gain a +4 bonus to Climb checks, and to Use Rope checks made to bind a prisoner.
Expending an entire roll as part of a Craft check to build an item, or as an optional material component for a fabricate spell, grants the created object +1 hardness and +4 hit points per inch of thickness.