Hi
Um If you use imagetool and you know how to write a batch file you can do batch conversions of all textures
What I normally do is copy the batch file imagetool and all the textures to be converted to a new folder and run the batch file
ok batch file copy this text
imagetool -dxt3 *.bmp
pause
del *.bmp
ren *.mip *.bmp
open notepad and past the text above,Then File~save as
file name call it say convert.bat then click on the dropdown list for save as type select all files then save
Now copy this file +Imagetoll.exe and all the textures you wan to convert double click on convert.bat and you shoud see imagetool go to work,when finished the dos window will pause hit anykey to continue then copy all the textures back to the aircraft/texture folder and ya done

cheers
Wozza