BIG-IQ Cloud and custom Catalogs

I've been spending some time trying to customise a new template as a BIG-IQ Cloud catalog but have run into a couple of problems. The iApps that I have been using are the f5.http and f5.http:ssl-offload and I am trying to make two fields Tenant Editable, these being the Pool Member Port and HTTP Monitor Send String.

For the Pool Member port, no matter what field I make Editable, I can't get the port number to appear when trying to deploy the application as a Tenant user.

For the monitor send string, when I specify one, an error gets returned that states

(can't read \"::monitor__uri\": no such variable\

I am using BIG-IQ 4.5 and BIG-IP 11.6 - I have been using the vCMP and Local Cloud connector

Has anyone else had a play with this yet?