@theluthier You could use the "Greater Or Equal Comparison Operator" as "Scripted Expression" for driving the "Copy Rotation Constraint's Influence" on Piero's "Toe Control Bones":
-var >= 0
"Positive X Rotations" gives "0" ("FALSE") as "Driver Value" and "Unrotated" or "Negative X Rotations" give "1" ("TRUE") as "Driver Value".
File is here.
Oh, I never thought of using Booleans in Scripted Expressions. Great tip Ingmar!
Although I personally would use var<=0 in this case, but that's nitpicking and I don't know enough about Python, but that might even be just as fast (it would be in C/C++).
spikeyxxx You're absolutely right using "var <= 0" instead of "-var >= 0" since it's the simpler expression.
Yeah, it probably doesn't matter for the computer, but for me it's easier to read and understand :D