to run firebird in linux current user login

Dear Members,
In firebird Linux distribution to run firebird server user login needs to be firebird or root. Even when I change permission of firebird installation (/opt/firebird, /usr/lib/<fb.libs>, /usr/include/<firebird.header> files) to Read write Executeion permission to all users , I was uanble to tart with my current user login. I get below error message ,
fbserver: Invalid user (must be firebird, interbase, interbas or root.

Is it not possible to start firebird in current user login. Because we have planned to bundle firebird along with our application. In that case firebird need to run with current user login. Please do help regarding this issue,

Thanks & regards,
S.Karthick