With this GUI you need know and type the eac3to parameters, but there are some help for you.
Was made this GUI for me and make more easy test eac3to, if you want use it you can try, also you can modify the source.
Initial version: UsEac3to06.7z
New version (only the GUI):
UsEac3to 1.3.4
Support until eac3to 3.49
The atached one are only the source, readme and only text files, the exe's are big to be attached here.
But you can compile yourself with
free Autoit3 to be sure than is virus free.
WARNING: the file Vid_enc.par is only my example file, if you have a customized one preserve it.