A couple things with the latest version:
There seem to be a couple of errors in the OBMM installer. First it asks about the Equip/Activation message, but the choices are the same as for the hotwheel position. Is this intended? In the ini, this is just simply a boolean (on or off). Later I notice it asks me again if I want a message displayed. Perhaps this is just a terminology issue. Second the default key for wheel 4 is left shilft, which is also the default for wheel 3. Shouldn't it be left ctrl?
Ok, now more importantly
I'm trying to test the multi-cast of summons with Supreme Magicka. First, I'm not sure I'm setting this up properly:
1. Assign a summons spell to a hotkey.
2. Ctrl-click a second summons spell to add another one.
3. Ctrl-click a third summons spell to add a third.
4. Click on the hotkey to switch it to multi-cast.
I don't have the modifier key enabled for switching between different key modes. If I'm doing this correctly, then the multi-cast of SM summons isn't working. Now I haven't tweaked the pre- and post- cast delays yet. I will try those settings now, but I wanted to verify that I was doing this correctly
Edit:
I played with the pre- and post- cast delays a bit and couldn't get it to work. Quite frankly I wouldn't worry about it. With Supreme Magicka, you can summon multiple creatures by simply recasting the spell. The number of creatures you can cast is limited by your conjuration level (you can also tweak this setting in the ini). So if you assign a summons spell to key 0, you can summon multiple critters by pressing 0 and hitting cast multiple times. If you use multiple hotkeys for different types of critters, you just press the appropriate hotkey and cast. So I can summon Elemental Atronachs and a Dremora Lord just by pressing a couple of keys (I've limited the number of critters I can summon to 4). Even if I had summons set up as a multi-cast, I probably wouldn't get all the critters anyway due to the limit in the ini file.
I can't make comments about the other magic overhauls, I only run Supreme Magicka, but those are my thoughts on the matter