_Version of Slic3r used goes here_
1.39
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Linux
Put some stuff on the platter who will fit the platter with some iteligent arangeing and then try to arrange

How it should be:

_Is this a new feature request?_
YES
+1
There is some obvious (and probably very easy to implement) room for improvement here.
PS: I'd have put the four circles beside the long parts and centred them all
PPS: is there a request for "ability to select and move all objects at once (in 2d view)"?
A new arrange algorithm is being implemented by @tamasmeszaros , I believe there are promising results already, but not yet part of current release...
https://github.com/Rhoban/Plater do a good job. I use it a lot awaiting for a good alternative in Slic3r.
New auto placement is implemented in SLic3r 1.41.0-alpha3. Closing.
Most helpful comment
A new arrange algorithm is being implemented by @tamasmeszaros , I believe there are promising results already, but not yet part of current release...