You will not be able to use the following features with Custom Maps:
Showing Vertical Lines on chart cells
Y Axis Zooming
Trend Lines
Targets
Showing labels outside the chart
Pagination
Displaying as a hierarchical table
Relabelling the X Axis and Legend
Hiding the X Axis and Legend labels
Changing the position of the Legend
Changing the length of the X Axis and Legend labels
Linking Y Axis