A user name and password must be sufficient to log-in to your site, surely?
It would make life much simpler for everyone who is posting queries as to why they can't log-in, if the security code obligation was not required
After all, this is a flightsim site not entry into a Government database!
the security-code is used to prevents bots (computers) to hack the website, it can be your nickname that they hack or the admin-nickname to destroy the entire website. So don't be annoyed about entering 6 digits into a box.
I can understand your concern about hackers but it is a miracle, sometimes, if I can even get a security number to appear in the box to copy, enabling me to 'sign in'!
If a massive site like Flightsim.com can cope with a nickname and password entry then I cannot see the problem this site has to do the same?