Is there any?, What another scriptable process to modify it you do know?
You mean the "allow remote connections" setting in management studio?
I'm guessing you dont want this. This option turns on the
What you actually want is this: How to configure SQL Server 2005 to allow remote connections (the naming convention here isn't at all confusing!)
In which case, yes there's a registry key. Assuming you only have a default instance installed, then the registry path is:
with a key for each protocol. eg. tcp, sm (shared memory) np (named pipes)
A value of enabled is set to 1 inside each key of tcp or np, depending on what you want enabled.
The easiest way (for me at least) is to script this with xp_regwrite which is an undocumented stored procedure, but does the job & means you can include it with your other sql server configuration scripts that run in sqlcmd/SSMS after an install is performed.