We don't tipically use the DS for remote control, but if you need a way to force an auto log in there is always the registry. I believe this will work with Windows 7 although I have not tried it yet but we do use it for Windows XP for other reasons.
There are three parts to this, the first is adding the autolog in:
REG ADD "HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon" /v AutoAdminLogon /d 1 /f
REG DELETE "HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon" /v AutoLogonCount /f
REG ADD "HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon" /v DefaultUserName /d useraccount /f
REG ADD "HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon" /v DefaultPassword /d userpw /f
REG ADD "HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon" /v DefaultDomainName /d %COMPNAME% /f
*note* if you want it to use a domain account change %COMPNAME% with the domain you want to use
Second Force a restart (power control to reboot)
Finally once it boots up, remove the registry keys to prevent remote viewing of the password as it will be in plain text.
REG ADD "HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon" /v AutoAdminLogon /d 0 /f
REG ADD "HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon" /ve DefaultUserName /f
REG DELETE "HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon" /v DefaultPassword /f
REG ADD "HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon" /v DefaultDomain /d %YourDomain% /f