Xavier,
let me expand on what rir3760 (i bet this was not a church-imposed name

) said.
> (1). New icons
There's no way you can insert new icons in 2x, but since it's using the system image list, any changes that affect that will be reflected in 2x. So if you use
desktop.ini you can change any folder icon. (if you find this too techie, then try the wizard from View | Customize this folder... menu in the standard explorer)
you can change regular file type icons (text *.txt, documents *.doc etc) using the Folder Options dialog from Start menu | Settings or within the control panel. Any icon changes will be read by 2xExplorer, after you restart the program.
> (2). Customizable Button Bars
unfortunately this is harder than it seems, and with so many other more important functionality details to be addressed, it's not high on my agenda.
HTH
Nikos
PS. thanks to rir3760 for the response. That's the idea of this forum, users helping users!