Both requested features have been implemented while ago. Please get the latest version.
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When the panel is sorted by type (so that the little grey arrow appears in the Type column header), it is subsorted by Date Changed. So all .txt files are listed together from older to newer. However, this does not follow the algorithm used by Windows Explorer, which subsorts Type by Name, so that all .txt files are listed together in alphabetical order.
On a related point, I note that there is a new item added to the context menu of the Name column header: "[sort] by extension". This is a nice feature, and I wish Windows Explorer had it! However, perhaps it would be good to place a little icon in the Name column header to indicate that this sorting is in place. (Currently, the grey arrow that usually indicates ascending or descending sorting order just disappears, making it difficult to see which sorting is being used.) I don't know what the icon should look like though! Perhaps a modification of the 'grey up arrow'.