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The hard part would be detecting character position.
When you select the drop down you would leave the text region
You would need to keep track of the last position or the user would need to enter that position.
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You need to use rules and submit actions on your buttons to specify each submit type.
If you use the packaged submit then it only does one by default.
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You need a list of dates probably, either inside the form, in Xml, in a SP list or whatever.
Then you would just use a filter to show the selected dat plus 6 or whatever.