adding applications on my AWS Hana instance

Is it OK to add new applications on the AWS Hana EC2 instance without destabilizing the HANA database server?

The SQLSCRIPT that comes prepackaged with HANA database appears very restrictive as some common SQL features such as CTE and array aggregations are not supported. As a result, traversing hierarchies becomes rather cumbersome and joins unnecessarily complex.

Is it possible to add another (non-HANA) database engine on the AWS HANA EC2 instance without destabilizing the HANA database?

Has anyone done that, and what was your experience? How easy was it to propagate data across the two databases?

Thanks.