Hi,
These feature can't be provided by HikaShop but by your payment gateways.
Paypal does not propose any kind of "authorization / sale" feature.
I remember that Sage Pay have a "authorization / sale" feature but the feature is not supported by the plugin, it will require some modification in the HikaShop core to propose it.
But it is something interesting that I will put in our TODO list.
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.