Hidden features you can use in BI

[Bernhard of Clairvaux]

This is all well-known I think. Resources cannot be added, just replaced. Thus the displacement of text and icons.

In BI you can add wild_animals (from RTW) and get a proper icon.

[Dol Guldur]

That is not an additional resource - that is merely using more of the base file's set list found in the Rome data folder (descr_sm_resources.txt is read from there but can be copied over to the BI folder).

It would be really useful to have more than 26 resources but it seems hardcoded. You can change them but you can't add any. Unless anyone has discovered different since the patch...