[Samba] editing important files with running samba

[kent E.]

hello to all...

does anyone here worry about the look of their
/etc/passwd
/etc/group

for me, yes i do.. i wanted to separate the users with pc accounts.. but
would my network go crazy if i will reset some of the gid and uid and
also i've noticed that the file 
/etc/samba/smbpasswd is also somehow link to the /etc/group ... any 

advice on how to properly edit things.. 
tia

kent