Other Ideas...
In addition to using situational modifiers, you may also consider some non-obvious weapon use.
A Giant using a net would be intresting. In addition to possibly covering a larger area, a Net will result in the opponent being entangled, and will force opposed Str checks to move beyond what the rope allows.
If you want to be really evil about it, you can arrange to have the net set on fire while the player is trapped in it. Harder to justify, but if the net is fire proofed in some way, or made of chain links....
Or it can simply be weighted and thrown into a deep pool of water to drown the player trapped inside.
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