This extension isn't brand new, but it has just been updated, and wasn't in this forum yet.
This extension adds an unlimited number of "extended" alterable values to any and every object.
Set Value: Set Ext. Alt. Value -name- of -object- to -number-.
Spread Value: Spread Value -number- (+-step-) in Ext. Alt. Value -name- of -object-.
Compare to: Ext. Alt. -name- of -object- -comparison- -number-.
Get Value: alt("ValueAdd", fixed(-object-), -name-).
v1.02: Added "Spread Value" action
v1.01: Fixed comparisons to an alterable value that hadn't been set always failing, now treated as "0.0"
v1.00: Initial release