Inconsistent select handling between dgrid/Selection and dgrid/selector

[msssk]

Open dgrid's test page:
dgrid/test/selector.html

In the 2nd grid ("A grid with radio selectors"):

1. Click the 'Set selection mode to "none"' button
   1.1 Click an enabled radio button
   1.2 Click a disabled radio button => nothing happens; good
   1.3 Click a cell in a disabled row (not a cell in the selector column) => nothing happens; good
   1.4 Click a cell in the selector column in a disabled row => previously selected row is deselected; bad
2. Click the 'Set selection mode to "single"' button
   2.1 Click an enabled radio button
   2.2 Click any cell in a disabled row => previously selected row is deselected; bad

Closely related, it seems like good UI design to have the dgrid/selector plugin handle all clicks in its column... meaning dgrid/Selection would have to not handle clicks in the selector column.