I haven't used Jammer in ages, but as I recall, what I did was, import the finished midi to my daw or if you have the piano roll editor in your version of jammer you can use that. Then go in and edit note by note the ending you want. If you can use a piano roll editor, you got it made.

I kinda like some of the very flexible parameters that jammer offers, it's just not as advance as BIAB, but it has it's place for an extra tool.