As far as I understand the ICA protocol runs natively over TCP port 1494. So you could simply create a filter to apply to TCP connections only and to port 1494 and simulate connectivity issues like latency and dropouts.
The tools you mentioned are usually browser extensions or proxy servers. Our
Connection Emulator is different as it uses a network driver to intercept all network connections. This allows it to apply simulations at the packet level and simulate real-world-like communication links.