That does not help much.
You have to explain further.
There is no problem in adding additional permission column in the database if you fix it properly.
As for a setting to define the permission.What exactly do you mean?If you mean a unique id for each program running then it will be complicated in winforms and very easy to incorporate in asp.net.
In winforms you have to either create a login system that will be used parallel with the database for identification or store certain characteristics of the pc used (such as mac address or hd id).In asp.net it's very easy to use a login system and add the user to permission groups.