I need to change the colour of my drawings but that colour is not in videoscribe's palette.  Is it possible to change it without having to go back to illustrator?

If the colour you wish to use is not available as a HEX code then you will need to edit the image before you import it into VideoScribe. 

If you would like to change the colour of a VideoScribe library image put the image on the canvas then right-click and choose 'export to SVG'.