Hi,
You can use the parameters "cancel_action" and "cancel_url" to specify that the "cancel action" will be an "url" and the cancel_url will contain the URL where you want to redirect the user.
After that, the toolbar is, since several months, a view that you can override ; you can use an override to create your own buttons.
You can also use a plugin to add some content into the toolbar ; it is my preferred approach but the overrides are easier to create.
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.