how can i manually create an user

[YourDoom]

hi
sorry for this question (i know you dont like to answer), but i want create a smaller control panel wich works with ispcp (ispcp is in background).
i have a skript wich creates an user + ftp account and i only need how to "connect" a domain to a ftp account
e.g. domain.tld connect to ftp "domain".
it all works but i have only problems with apache (domain-connections).

or is there any way to insert anything in mysql and a cronjob do that for me? or can i include i file, wich can make it easier?

thanks for any help