Does anyone know if it is possible to add more objects to an original scenery tab in rct2 (ex. wonderland tab or western tab)

Was thinking if a person knew the file names, tab name, bmp name of the original then they could use Dat Maker and make a duplicate using the same names for the original files, then adding the extra dat files and saving it with the same name. It would then write over the originals and you could have more items on each tab.

I have a few favorite custom items that I love to use, but can only use them when I create a scenario and I would like to use them with the original scenarios.

Also, is there anyway to get custom rides into the original scenarios?

Thanks for the help!