I'm installing TTW for the first time and had to redownload vanilla versions of both games from Steam and have a few questions. I always clean the base and DLC .esms before adding mods or trying to play the game. However, I read on the TTW install page somewhere that you shouldn't clean the esms and esps as TTW needs the information in these. I was wondering if this only applied to the mods you add after TTW is installed? Or to the base game esms as well? i.e. should I just leave the FO3 and FONV vanilla DLC esms as they and just install TTW without cleaning them first?
Also once TTW installs, is it safe to clean them afterwards? Or just leave the game/DLC .esms as they are? What about other mod overhauls which have global effects (like NMC texture pack, PN etc). If the author says it's safe to clean these, then can we do so if they have dirty edits? The only exception to a major overhaul mod I've seen so far is Vurt's Flora Overahul where you explicitly aren't supposed to do so.
Final question: merging the TTW optional mods is forbidden. But would it be possible to create a merged patch for all other non TTW mods? I was hoping to install mods like CRAFT, WMX etc. which share vendor lists/game resources like the workbench etc. If a merged patch isn't feasible, then does TTW have the capability to coordinate mods the way FWE did in FO3?