1. A computer-implemented method, comprising: defining a graphical user interface configured to receive an edit command via at least one touch input and to edit a document in response to the edit command; accessing data from at least one touch sensitive device, the data representing a plurality of simultaneous touches within a touch area of the at least one touch sensitive device; in response to a first touch input defined by at least one of the plurality of simultaneous touches, adjusting an application control parameter for the edit command, wherein the application control parameter controls a visual characteristic for content in the document, wherein an editing tool modifies the content in the document using the visual characteristic; and in response to at least one second touch input defined by at least one other of the plurality of simultaneous touches, editing the document by performing the edit command using the application control parameter as adjusted in response to the first touch input, wherein performing the edit command comprises using the editing tool with the adjusted visual characteristic to modify the content in the document.
1. A computer-implemented method, comprising: defining a graphical user interface configured to receive an edit command via at least one touch input and to edit a document in response to the edit command; accessing data from at least one touch sensitive device, the data representing a plurality of simultaneous touches within a touch area of the at least one touch sensitive device; in response to a first touch input defined by at least one of the plurality of simultaneous touches, adjusting an application control parameter for the edit command, wherein the application control parameter controls a visual characteristic for content in the document, wherein an editing tool modifies the content in the document using the visual characteristic; and in response to at least one second touch input defined by at least one other of the plurality of simultaneous touches, editing the document by performing the edit command using the application control parameter as adjusted in response to the first touch input, wherein performing the edit command comprises using the editing tool with the adjusted visual characteristic to modify the content in the document. 12. The method of claim 1 , wherein the application control parameter comprises a range of colors to be applied in rendering a surface in the document, the surface defined by the respective location of the touches of the plurality of simultaneous touches in a second portion of the touch area.