Hello,
I noticed that the one tab ic2 gets a bit full in creative mode so I thought it might be time to split it up in different tabs. If the advanced solar panels and graviton suit addons are installed they even use the same category. My idea would be the following:
One tab ic2 machines
One tab with tools, weapons & armor
One with cells, craftable parts and maybe fluids
One with all resources, powders, plates, ingots and so on
The other blocks, plants and such could be either sorted in the normal minecraft tabs or in an extra ic2 misc tab
That would make looking through the items and/or finding items much easier, especially if you forgot the name or the search function doesn't work (mine is broken atm and I don't want to find the mod which causes it)