Thanks for considering Sitecake! Let me answer your questions.
- Tables are not supported at the moment. We are working on v3 version in parallel to v2.x. It will bring js third party plugins, so any developer will be able to add tables support. It is scheduled for August.
- Same thing for image slider. We plan to create nice image slider that works with Sitecake well. Also make it easy for users to manage photos. But after August. Before that, you can create a hack, put images on an empty, non linked page for the user, allow the user to manage images with Sitecake. Then create a script that will pull the images from that page and show them in the slider, on another page(s). But, this is a hack, of course.
- Page manager is a feature of 2.4 version. Hope it will go live in July.
- We will fix this push in an update in 2.3.x version. In a couple of days.
All your feature requests are good and on our road map. They will find their way in Sitecake in a couple of months. So come back then, I am sure Sitecake will bring few more surprises too.
Re: side by side modules. Use columns. That's all that is possible now.