I'm assuming SR600 is a typo, so I searched for S5600.
Page 46 of the manual indicates a flash range of 30 cm to 2 m while in macro mode. You should be able to utilize flash for macro purposes.
You can apparently also use external (remote/off camera) flash too, which coupled with good overhead lighting, should greatly help for indoor macro photography.
Some links....
http://www.dpreview.com/forums/post/16819560
http://www.dpreview.com/forums/post/16820369
http://www.dpreview.com/forums/post/16820426
I'd look into setting up a softbox for doing indoor photos. This can easily be done by making a cube frame out of PVC pipe, then covering the frame with stark white cloth (I cut a twin sheet into a cover, sewed the edges, and used white Velcro to secure it). You can then opt to use a nice bright overhead light (something in the 5200-6500 kelvin temperature range), as well as lighting from both the left and right sides to drown out shadows. ORRRR...use flashes for the side light.
Example: