What is it that is stopping you from using more than one "CF Drive" at a time?
AmigaOS supports a lot of drives.
The only way something could "stop you" from using multiple drives would be... a screwey hard drive controller? Or a screwey driver? Or ?
Or I don't know why but it does happen with my A4000's IDE. In fact, the CF card doesn't even work with a CDROM on the same cable. This is a Sandisk 4 GB.