1 - The listing command is can't be modified, so what you get is what you get. If you send the elements to the data table, however, you can add some basic information by using the "Show/Hide Column" dropdown and selecting "Add Mass Properties." That doesn't get you side lengths, but does give you info area, volume, mass, etc. If you want custom quantities such as diagonal, you'd have to write an API that calculates that data and sends it to the data table
2 - Not currently, but this is a nice idea and something we could explore for future versions. Can you be more specific in what you're looking for?
Thanks for your reply.
About the entity info. menu, when moving mouse over the elements, it would be nice to see more properties like the moment of inertia, groups and layer that the element is belong to,... a selection of output forces, stresses, displacements,... "something like the data table capabilities but quicker and easier".
On the Selector toolbar under the "Selector Mode" menu, you can turn on "Layers/Groups in Tooltips". In that case when you move over an element the Entity Info window will show the layer for the Element and all the Groups that contain that element. In addition, if you are in a PostProcessing View... deformation/contour/criteria/etc... the results being displayed on that node or element will also be included.
This is what I was at point to suggest, the use of "Show Layer/Groups". This is a critical feature, I LOVE IT, but is unknow to exist by most users, I suggest to set it active ON by default, not let the user to active, this way LAYER & GROUP info of the entities will be output by default in the ENTITY INFO area, not only when using TOOLTIPS, but also when using commands like DELETE POINT, or DELETE MESH, etc.., this is a trick I use a lot, thanks!.
It is possible to select up to 3 forces/stresses in postprocessing if they are on different elements...for example beams, plates and solids. You can not select multiple values for the same element. If you want to do that, you can use the List->Output->Query command, select all the results you want and then click on the elements you want. The results will show up in the Message window