Convert NLA strips to one single action

I was just wondering whether it is possible to convert all NLA strips into one single action? I need to be able to adjust the f-curves of my animation but I can’t do it with NLA so I was wondering if it was possible in Blender 2.5x to convert all NLA action strips into one big and single action. If not, is there any scripts available that does this?
Thanks in regard.

Hello blender user, it has been a year, but if u still did not find your answer, I will tell you.Yes it is possible. The tutorial will tell you everything.

reference: http://www.youtube.com/watch?v=7x3fAD4yKNI&feature=results_video&playnext=1&list=PLF681F1DEA6ADBF38