Template Repeater
from javax.swing import SwingUtilities
from javax.swing import JScrollPane
scrollPane = SwingUtilities.getAncestorOfClass(JScrollPane, event.source.parent.getComponent('Template Repeater').getComponents()[1].getComponents()[2])
scrollPane.getVerticalScrollBar().setUnitIncrement(30) #scroll amount for wheel and arrows
scrollPane.getVerticalScrollBar().setBlockIncrement(30) #scroll amount clicking on scrollbar itself
Template Canvas
from javax.swing import SwingUtilities
from javax.swing import JScrollPane
scrollPane = SwingUtilities.getAncestorOfClass(JScrollPane, event.source.parent.getComponent('Template Canvas').getComponents()[2].getComponents()[0])
scrollPane.getVerticalScrollBar().setUnitIncrement(30) #scroll amount for wheel and arrows
scrollPane.getVerticalScrollBar().setBlockIncrement(30) #scroll amount clicking on scrollbar itself