@occassionallyaduck
In theory, to do what you are suggesting, various files of the webMAN-MOD project need to be modified, additions need to be made to scan a ROM folder, make a list of those games & create xmb entries. This part is completely feasible of course as all the hard work has already been done.
A web command to launch a self from the newly created xmb entries could be created as well.
Obviously there is the dependency issue where this feature would need a working RetroArch installation but I suppose a wMM RetroArch Edition could be created.
Obviously in 5mn, I have probably not envisioned every single aspect of the problem but at first glance, if you can already do such a thing by tweaking files, I don't see any particular obstacles to making it work from wMM.
If wMM is found to be a bad choice for some reason, another option would be to create another plugin altogether, just for RetroArch. One could even envisage to produce a system plugin that would scan a ROM folder at boot or on call, create the xmb entries & be directly callable from the XMB's XML files through 'action', just like xai_plugin.
Remain the practical part which is the programming, except Aldo, hardly nobody contributes directly to the source.
Personally I would be naturally enclined to look into it but I already have 3 other projects ongoing & very little time for those atm so it would not be realistic at all to offer my help.
I dunno whether
@aldostools will like this idea. Let's hear it from him... [emoji6]