Can I limit how high my pledge gets?
Yes you can! You can set a pledge cap on each goal. For example, normally if you derailed at $10, the pledge would automatically increase to the next step in the pledge schedule which is $30. But if I cap it at $10 it will stay at $10 and all subsequent derailments will cost $10.
Click the pledge amount in the top line on the goal page to bring up the pledge settings. To set the pledge cap, pick it using the +/- stepper buttons. Click Update to save changes.
You cannot (currently — this is kind of dumb) select a pledge cap lower than the goal's current pledge. If you want to do this, first step down the current pledge to that amount or lower, and then the desired pledge cap value will become available.