Hi cyril,
I've done it before and it's quite easy.
You should create a new JCE profile in the back end profile management of JCE, then select it only for SEBLOD and front end use if that's what you want. Adjust the rest of the newly crated JCE profile options, and make a SEBLOD Wysiwyg editor field and choose JCE as the editor.
Best regards,
ricco