I see what the original poster is getting at.
I have encountered a similar issue with text. I seem to be unable to click on a text 'object' after placing it in my image and moving on to something else - I guess because in fact, it is not remembered by the program as being an 'object', it is now just part of the layer that it was placed on.
What I would like to be able to do is to click into an existing text field with the text tool, and edit the existing text - delete individual characters, change the font, etc... as if i were adding the object in the first instance.
I think the original poster was imagining the same scenario with all objects - so each object created would remember the fact that, in the first instance, it is a separate object rather than just part of the overall layer, it would remember its dimensions and any other properties that are editable for that type (e.g. font size for text). Also, after placing an object onto the layer, such as a rectangle, there would be a 'select' ot 'lassoo' type line around the object - communicating to the designer that the object is still editable - so it could be stretched, for example, or its colour changed simply by changing the primary colour with the object still highlighted.
Using the Move tool (or the original tool, or a new Edit Object tool?), you would be able to select that object at a later point in time and alter it in the same way as described above.
Mostly for me at present, the issue is with text, it is fairly time consuming to have to keep re-doing text, especially if you have moved on to using different colours.
Just a couple of cents worth.
May I just say at this point that the above are just suggestions, not criticisms, and after only downloading the program this morning I think it is fantastic, very easy to use, and in some ways better than Photoshop, certainly in terms of performance.
It's a joy to use, thankyou for creating it.