Symbolic Link !!!! that's the solution 
I'm not an expert so i didn't think about this, but it could works. Tonight i will try and i let you know. Thank you very much. I think that for the next release someone should add the feature for changing the path of the resources...
Trust me, I read again and again wiki and manual and I'm sure that there isn't what I'm looking for. wiki says: <ul style="box-sizing: border-box; padding-left: 2em; margin-top: 0px; margin-bottom: 16px; font-family: 'Helvetica Neue', Helvetica, 'Segoe UI', Arial, freesans, sans-serif, 'Apple Color Emoji', 'Segoe UI Emoji', 'Segoe UI Symbol'; -webkit-text-size-adjust: 100%;"> <li style="box-sizing: border-box;"> <p style="box-sizing: border-box; margin-top: 16px; margin-bottom: 16px;">During this reboot, recalboxOS will create on your USB device, a new folder called <code style="box-sizing: border-box; font-family: Consolas, 'Liberation Mono', Menlo, Courier, monospace; font-size: 14px; padding: 0.2em 0px; margin: 0px; background-color: rgba(0, 0, 0, 0.0392157); border-top-left-radius: 3px; border-top-right-radius: 3px; border-bottom-right-radius: 3px; border-bottom-left-radius: 3px;">recalbox which will contain the <code style="box-sizing: border-box; font-family: Consolas, 'Liberation Mono', Menlo, Courier, monospace; font-size: 14px; padding: 0.2em 0px; margin: 0px; background-color: rgba(0, 0, 0, 0.0392157); border-top-left-radius: 3px; border-top-right-radius: 3px; border-bottom-right-radius: 3px; border-bottom-left-radius: 3px;">/share partition of your recalbox.</p> it's not what I asked for. in the forum there are plenty of other users that asked for this but no one answered clearly, the only answer is always "read the wiki". i repeat my question: there is a way to redirect the roms folder to the one I already have, without moving it to "recalbox/share" ? thanks
i have the same needs: i already own a huge collection of roms on my external HD, and i want to use it with recalbox. The point is that i DO NOT WANT to move my entire collection in the folder "recalbox/share/roms" ! is there a way to point to the ROM folder i already have? Thanks