[galaxy-dev] percent and pipe sign in text input fields

Hello all, I have a tool based on blastdbcmd that contains a param tag of type text. I want to be able to use the % sign in that text field users can enter (%g is for instance the field identifier for gi). However, if I do for instance %f or "%f" it returns Xf or "Xf" in the the variable. For single field lines I solved it to remove the % from the argument and only add it at command line, but in this case it can contain % signs anywhere... For instance %g|%a|%t should return by the tool gi..|accno|title. However the variable returned by the tool xml is "XgXXaXXt". So it also masks the | (pipe) sign... How to solve this? Thanks for any help. Alex