Some thoughts for potentially useful features I've not found a way of doing in the current DesignSpark PCB software:-
1) Include dashed, dotted and dash-dot line styles.
These are useful on schematics for indicating multi-pole switches, ganged potentiometers or boundaries around functional sub-sections.
2) Allow foreground text colours to be changed in the properties dialog for a text object on a schematic.
Currently, you can change the colour of a text style but not the colour of a specific text object. This is useful for highlighting important notes etc.
3) Allow library components that do not form part of the PCB being designed to be added to a schematic for reference purposes.
These components would not be transferred to the PCB drawing or added to the BOM etc.
This is useful for showing off-board connections to external components fitted to panels such as switches, potentiometers, LEDs etc.
I have resorted to drawing these components manually using lines.