Hi @Yasaman_jenab ,
For the templated HVAC systems that come with LBT Honeybee, I can assure you that everything that is exposed on the Honeybee SDK layer is already exposed on the component inputs. Those templated systems are meant to be simple and fool-proof so there’s not a whole lot that can be customized on them while working Honeybee.
However, if you really wanted to go with a scripting route, you can write an OpenStudio measure in Ruby using the OpenStudio SDK. In OpenStudio, you can customize whatever details of the system that you want since it’s a full SDK for HVAC systems. You can apply the measure to the Honeybee model using the HB Load Measure component and then plug that into the measures_ input of the HB Model To OSM component.
… or you can just learn Ironbug. @MingboPeng has some good tutorials and here is how you apply an IronBug HVAC to a LBT Honeybee model: