Similar to the great thread by @pauliunas, this thread should act as a small backlog for the community and Eve to just draw from a pool of crazy ideas for future projects.
If you've got an cool idea for a (maybe not even feasible) crazy feature that doesn't fit into the current project (Current Project: Pyramid Flipper), then just post it here. When the time comes, we as the community or Eve might come back to it
Please note, that your idea might be summarized, but I'll try to provide a link to it anyways so people can read your original great idea
On that note - here comes the list (will be updated with more entries once they come in)
Extreme Battery Life (by @iKirin) : Most projects of Eve tried to get a damn nice battery life for their devices. The T1 sported 9-11 hours of battery life. This idea revolves around making the device bigger (read: thicker) as it might already be, and add a bunch of extra weight for another battery to get maybe even more battery life like 15 or even 20 hours out of a device.
'Performance Mode' (by @AntonyTerence): Basically, a device is normally designed not to get hotter than X degrees C (usually to also limit power consumption and make it not too hot). There could be a 'performance mode' where the temperature limit is set higher so we can squeeze out extra performance, while still making sure the other components are not damaged.
Dual Camera (by @AntonyTerence): Dual-Camera to allow some neat things like switching focus or whatever can be implemented with it (Wide-Lens camera and normal-lens e.g.)
Keyboard with second Screen (by @nawthor & @SombreSire): A E-Ink Display or similar on the keyboard - or just a touch-sensible display as second-keyboard (with E-Ink this would literally take nearly no power and be customizeable - but the feel for typing will probably be pretty bad)
True x86 on a mobile device (by @AntonyTerence): First that comes to mind is a cellphone, but also a small tablet with true x86 (read: Full Windows 10 or Ubuntu or whatever) would be quite impressive.
Keyboad with Battery, Speakers & Ports (by @AntonyTerence): Simply a keyboard (for mobile devices) that is connected to the device and acts as hub, has a nice battery (that could power the hubs), and decent speakers.
Idea for making a backlog-feature thread goes to @Konstantinos. I just wrote down some of the crazy ideas I found from other cool people on this community