1. Many accelerators have either SCSI onboard or a SCSI-addon. Squirrel connects to the PCMCIA-port and there even was an adaptor which connected to the IDE-port.
2. The PCMCIA-port of the A1200 wont do much more than some 1.6MB/s (if I remember correctly). A much better option is an accelerator with SCSI.
3. There are several buffered 4-way IDE-adapters which connect to the IDE-port.