I usually use the Rename Tool, Total Commander brings along. Since I'm using DOpus I've tried to work with the integrated Version and I have to say, that this is hardly usefull considering that not every user is a computer crack or programmer. Working with regular expressions is no problem for me, but If you take a look e.G. at the Total Commander Version of a Multi Rename Tool, you might also find, that this solution is much more easy and better to learn.
I for myself am able to create a complex renaming task using Total Commander and I like this option much more then writing a small script for DOpus. 3 clicks in Total Commander and it is finished.
But of course for really really complex renaming operations the DOpus Tool is much better, but for normal usage, in my opinion, it could be made much more simple and more user friendly.