I don’t have a view of the rules, so it’s difficult to know.
Mostly my experience is of surprise when it isn’t consistent, for example:
boxes affix on drop
walls affix on double-click and have separate drop behavior
Can affix not simply always be double click? Do any items have a separate build and affix?
For items which currently affix on drop, then they could have affix on both drop and action.
I take your point that water has 3 possible actions – drink, pour, drop; but that’s a separate problem.