Yes, you can. Simple Application Servers (SWAS) with pre-installed applications already include applications and development environment. SWAS with system images work like a common server, you can install applications or software after connecting to your SWAS. For example, run
sudo yum install python to install or update the Python packages.
[admin@LocalHost ~]$ sudo yum install python
Loaded plugins: fastestmirror
Is this ok [y/d/N]: y