A few Suggestions

[XerVision]

UNUSED VARIABLES
Great catch on unused variables. Can you add a loop to this find so that all unused variables can be caught at once instead of having to hit run each time.

SEARCH AND REPLACE
It woould be nice if this tool could also just "replace" (meaning, where it searched) instead/or in addition to "Replace Next"

[Erel]

1. You can use the Build option instead of Run (press Ctrl + B) on the device.
2. There is a Replace All option just under the Replace Next option.

[derez]

Erel
Xervision is right,
there is no single "replace" which act on the string that was found.
What you have to do is put the cursor a few letters before and then hit "replace next", otherwise it replaces the next place which you have not seen yet !