Hello,
In order to change the carousel, yes you have to override the "product / carousel" view.
The current system is using "mootools" in order to create the effects and we have in our TODO list a task in order to entirely rewrite it using a jquery library.
If you want to learn more about the actual system in order to be able to modify it ; it is based on the "FX.morph" feature of mootools :
mootools.net/core/docs/1.6.0/Fx/Fx.Morph
Depending the transition mode, you can have different effects, with a one direction slider or like a "ping pong" slider..
I guess that your goal would be to find the most appropriate transition which will be a right to left one.
Regards,
Jerome - Obsidev.com
HikaMarket & HikaSerial developer / HikaShop core dev team.
Also helping the HikaShop support team when having some time or couldn't sleep.
By the way, do not send me private message, use the "contact us" form instead.