I really like the "1.0.1" part of the addon's name ... because that suggests that there may be more to come.
My (first) votes are:
- some way to save and reuse queries ... even something basic like you have used for Advanced Search criteria lines would be OK
- adding a comment field, for the saved query, would be good ... ie. like you have for Custom Collections ... it would be good if you defaulted to the comment for the line's hover tool tip
- it would be good if there was a checkbox to deactivate an addon, ie. without uninstalling it .... to supress the ugly sql icon that you have put into the tool bar
... I think that would be generally useful extension the the Addons facility.
- it would be good if the sql window had the option to open in a std MM5 tab, instead of in its own separate window