looking to modify my brake or get another one, any help?

I have a cheap harbor freight 36" and I'm wondering if anyone ever modified a brake to allow a "z" type bend? I don't know if I worded that right but basically for the jambs of rockers. Say I wanted to bend in one direction than an inch after bend in the other. My brake doesn't allow me to do that and I think that's pretty important. If I can't modify mine I guess I'll look into getting another one a little bigger, maybe a 48". I dunno, just looking to get those type of bends to fab up rockers if I had to. Any suggestions on the cheapest brake I could get that does that. I can't spend a ton and if need be I'll get a better one later. Any suggestions appreciated, thanks.