oh now that i remember:
9) when i mouse over the grid, i can see the cordinates (this is block 0, 74, 1 - for example) but i would have really appreciated if somewhere i could click, drag, and see (in numbers) the width and height of my selection or item i'm about to add. for example, i was trying to measure a 60 by 60 prefab, and i wanted to add a special block at intervals of 10, and 20 so that in-game i could easily measure the distance by eye.
With your editor i had to place a block in increments of 2, and on every 10 add a concrete block, and on every 20 add a polished steel. At first i thought this would be easy, i would just do 1 set of ten, copy, and paste...but the strangest thing kept getting in my way. I would copy the marker at block 0 and the marker at block 9 (measures 10), copy, and paste, but no matter how i copied or pasted it...the next paste would be 1 block shorter than the last, and the next set would be yet another block shorter.
so to sum it up, i couldn't rely on copy and paste, and i suspect it's operator error but i can't see it. so i had to create my own ruler, and then delete said ruler when blocks were in place. This was slow, if the rectangle paint selection tool or the paint device just had a built in height and width thing like this:
http://i.imgur.com/nUFBqWY.png it would have been much easier. that's paint.net,
10) also, if i could adjust a selection rectangle like i can in paint.net that would be useful
11) i didn't watch more than i had to of his vid because i wanted to jump in and get my arena made. i personally feel that he needs to narrow the scope of his videos or break them town into more on point "topics" so that we can look for a title that suits are current need, and just watch that instead of him going on about other stuff i had no interest in. The quality was good, on voice and visuals...but when i see "22 minutes" and it's not telling me how to "dive" in, much less cover the install (install was simple, but that error threw me off) then i don't really want to watch it. He just needs to focus in on more specific topics i think. maybe i can make one too just to "get people started" even if it's a bit barebones.
the guy did good, just too long a watch time for something that also talks about things i'm not trying to do right now.
12) the icon to the left of "invert current selection" has no name or tooltip
13) would be nice if the tool tips explained a bit (or a lot, after all...we don't have to read them) more
14) what does Dev Test button do? and insert prefab? kinda ties into #13
thats all, i think.