For anybody interested in exporting/importing scripts, I think I have found a way to use MWEdit 0.6.1 scripts export/import (at least, it works with my Windows XP home).
1. in MWEdit scripts tab, select all scripts you want to export, right click and Export... to your chosen folder
2. leave MWEdit in the background, load the exported scripts (MWEdit creates one scriptname.txt for each scriptname) in your preferred text editor and do all your search/replace, editing and such
3. when done editing, focus MWEdit again, select File\Import\Script(s)... option.
4. here is the tricky part: the problem with MWEdit Beta scripts importing (or with Windows dialog) seems to be related to the length of the file names buffer: if filenames list is more than about 200 characters long, it seems MWEdit ignores it and does nothing. So we need to break the list in smaller parts.
In the "Select scripts to import" dialog, select all previously exported scripts but DO NOT PRESS OPEN BUTTON; instead, copy/paste the content of the File Name field into a blank text document (which I assume will be in your preferred text editor). Then , break the long, unique file list line in more lines of about 200 characters max.
CODE
example: the file list
"DL_PublicLock30.txt" "LB_TEST.txt" "Lb_SmokeScript.txt" "Lb_SmokeScript3.txt" "Lb_SmokeScript2.txt" "lb_level8.txt" "lb_level7.txt" "lb_level6.txt" "lb_level5.txt" "lb_level4.txt" "lb_level3.txt" "lb_level2.txt" "lb_level1.txt" "LB_Global.txt" "LB_CrimeScript.txt" "LB_CrimeGuardScript.txt" "LB_CrimeCommentScript.txt" "DL_StoreLock60.txt" "DL_StoreLock40.txt" "DL_ResLock60.txt" "DL_ResLock50.txt" "DL_ResLock30.txt" "DL_ResLock20.txt" "DL_PublicLock60.txt" "DL_PublicLock40.txt"
should be divided into 3 lines;
"DL_PublicLock30.txt" "LB_TEST.txt" "Lb_SmokeScript.txt" "Lb_SmokeScript3.txt" "Lb_SmokeScript2.txt" "lb_level8.txt" "lb_level7.txt" "lb_level6.txt" "lb_level5.txt" "lb_level4.txt" "lb_level3.txt"
"lb_level2.txt" "lb_level1.txt" "LB_Global.txt" "LB_CrimeScript.txt" "LB_CrimeGuardScript.txt" "LB_CrimeCommentScript.txt" "DL_StoreLock60.txt" "DL_StoreLock40.txt" "DL_ResLock60.txt"
"DL_ResLock50.txt" "DL_ResLock30.txt" "DL_ResLock20.txt" "DL_PublicLock60.txt" "DL_PublicLock40.txt"
5. for each of the (now short enough) file list line, copy it in the MWEdit "Select scripts to import" dialog File Name field, and click Open button to import each line separately. You should be able to realize if importing is working from a noticeable delay; if there is no delay, probably the list line is not short enough and MWEdit ignored it so you have to shorten the line and retry.
6. Enjoy/edit/compile your batch edited scripts inside MWEdit
There is not a direct way to import back all the scripts in TESCS, but it can be done using Enchanted Editor:
1. save your MWEdit edited mod with a different name (I.E. myModNew.esp)
1.b (safety step) load myModNew.esp in TESCS, save it from TESCS
2. open myMod.esp and myModNew.esp in Enchanted Editor
3. copy and paste the scripts from myModNew.esp to myMod.esp
4. save updated myMod.esp
5. load myMod.esp in TESCS (with Wrye GMST vaccine also loaded to avoid problems if myMod.esp has not Tribunal/Bloodmoon as masters) , Script Edit, Recompile all
[Edit] added safety step 1.b