on my VW TDI, the lane change signal is configurable in the computer. 3 is the default, can change it to 5 and something else.

 

That is exactly what I thought until I drove cars with this feature. It is especially handy in congested cities where cutting in and out of lanes is the norm.

 

You need a seperate after-market device available at relatively low cost to have this feature on your RX 8; it can not be derived etc. from the existing turning signal system/circuit; it has to be added/integrated with that.

I fitted the next intermittend working module (of which the installation is relatively easy, especially since the "Waeco-RX 8 installation diagram" is available) and I am very happy with it; it works wonderfull and allows you more attention to the driving itself:
http://www.waeco.com/tmp/MT-2000_E_10s_05.pdf

From a Waeco-specialist in Europe (also ok for abroad) I received the next installation diagram that was specially adjusted by them (with a proviso) for the Series 1 RX 8:
see PDF-file.
If you cannot find the electric connectors in your car immediately, I advise to consult the official Electric Diagram of the RX 8; page 58 (and pages in front/thereafter).
No specific electric skills are required; any smart DIY can do the job...........

Best regards, Ruud