Would it be possible to introduce some or all of the following features?
- a 'step' border node on for-loops, associated with [i], to specify the step value so that [i] can be incremented (or decremented(?), which would necessitate an initializer for [i]) by the required amount
- one might also want the step value to vary, as a function of something, of [i] perhaps
- a pair of 'low' and 'high' border nodes, to specify an interval instead of specifying N
Feel free to dream up as good a UI as you want for this :).