hidding 'cachedir' and 'workspace' directory - Ubuntu

Bonjour,
using Ubuntu 14.04, Modelio 3.4.1
A directory 'workspace' and sometimes 'cachedir' are created when one launch modelio in the execution directory. I want to install modelio for all users (in /usr/share/modelio or so, readonly) and do not want these directories to "pollute" student' home directories.

What is the best solution?
- launching the tool from /tmp
- launch the tool from ~/.modelio/tmp

What are these directories for? Can we just remove them?

Thanks for any piece of information
Jean-marie