It is not possible yet. What would you like to achieve? what are your use cases?

I'm importing server log of an android application to piwik.
Log lines has below field within:
Appcelerator Titanium/1.0 (GT-I9300; Android API Level: 16; en-US;)

By now I'm importing this field as user_agent which is a predifined variable, but I want to import it into three separate fields. First part as user_agent (Appcelerator Titanium/1.0), second part as device_name (GT-I9300), and thrid part as android_api (Android API Level: 16).

How can I do that?
Thanx

Do you mean that you would like to detect accurately the visitor Browser (titanium), Brand + Device (GT-I9300) and the OS as Android API 16? in this case maybe the correct fix would be to improve the DevicesDetection algorithm so that Piwik tracks this user agent correctly?

See other tickets related to DevicesDetection: http://dev.piwik.org/trac/query?status=assigned&status=new&status=reopened&milestone=DevicesDetection+Plugin&col=id&col=summary&col=status&col=owner&col=type&col=priority&col=milestone&order=priority

Maybe add a new one for this user agent?