is it possible to set custom path for the lock and temp files in firebird 3 embedded via config file or anything else ?

i want this to test my web application in a shared hosting before i buy a vps or a dedicated server .

i remember that i have tried some time ago with 2.5 without success  because the firebird engine have no access to program data folder in a shared hosting .

so i am wondering if this is possible in fb3 or fb2.5 :p

any idea or information on this is much appreciated :)

thanks .