Keep the Spacing value active when you have 1 artboard in New Document dialog
I often start with 1 artboard only in a new document (and I create these using classic dialog, because it’s faster than the modern one). There is a bug with the value used from a previous session (like 20 mm I love) looses precision (becoming 19.999 mm)... I reported this problem here — http://illustrator.uservoice.com/forums/601447/suggestions/51116116
But even with this bug fixed, I don’t see why this field should be disabled.
I can see why Columns is, and other options in these section... but the Spacing GETS used when you create a new artboard LATER — and Ai offers now way to set one (and I requested to be able to here: http://illustrator.uservoice.com/forums/333657/suggestions/43218936)
The only way to tweak this value after a document is created is to Rearrange... and it’s allowed only with at least 2 artboards. So I have to create one with a wrong spacing first, and then perform rearranging I don’t need, risking to ruin my layout and design and grid, only to change a value?
This is stupid.