Hi,
The parameters are their to be sure that the resource will be not stored in the browser cache after HikaShop updates or CSS modification.
No it is not possible to put them in the URL like that unless you code yourself something in your HTACCESS or use a SEF extension which can handle that.
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.