1. Why would I prefer this to asn1c?
2. Are there any plans to support PER?
If a2c generates code more useful to you, you would prefer a2c. We
think that is / will be the case for many ASN.1 modules, but we don't
have any strong data for that yet.
> 2. Are there any plans to support PER?
Not yet. Most applications that we are interested in (security
standards) use DER and BER only. PER can be added, of course.