There are some questionable design choices in the SMO editor within K2 Designer. When working with only a few methods, params and properties, it's fine but as soon as you start adding more to an SMO it becomes difficult to use and manage.

Basic features that are needed:

1. Allow sorting of properties by type or name.
2. Design a way to see which properties are used by which methods

When editing a ServiceObject method:

1. If you maximise the screen, only the bottom part gets larger. This makes it very difficult to see parameters if there's more than 4-5. The bar in the middle should be moveable so more screen real estate can be given to either input or return properties.
2. The popup for "map ServiceObject property" is too small and should have a different way of selecting properties/parameters than dropdown lists. Also, if you're on an input property, it's quite likely you will want to add a parameter, not an SMO property, so default the options accordingly.
3. If using 'Create all', ask if I would like to use existing items before just automatically creating a series of new properties with (1) on the end of the name.

And as a side note, please look at adding version control of some sort to Smart objects, similar to views/forms.