File > Save Startup File (Ctrl+U) allows you to save the current session as the startup session file. So just make whatever changes you want, save the startup file, and it should stay like that from then on.

No, I don't, but as long as it looks right in Textured mode, it should be fine in Source as well.

Go to Object Mode, press Alt+H to unhide any hid objects, press A once or twice to select all objects, press Space, search for "Apply", click on "Apply Object Transform", tick all three options on the bottom-left side of the viewport, press Space and apply object transforms again to make sure all objects have their transforms applied, and then export again.

引用自 Zappy：

and ignore the "you can easily compile this" error.

Un-do the deletion of bones, export as DMX, and ignore the "you can easily compile this" error.

Do you even read?

In the Source export panel, set the weight link cull threshold to 1, and export. Done. That's all you need to do to export it so you can compile it for Source. Like I've said at least three times now.

引用自 Zappy：

- Blender Source Tools will either tell you "too many weight links, you can't compile this model" or "too many weight links, I'll just cull it down to 3 for you" - of which you are getting the second message. -

It either tells you "too many influences" or "I'll cull it down for you", of which you get the latter message if you set the scene threshold to 1, which will allow you to compile the model for Source.

引用自 xDShot™：

Or try using this script. It removes exeeded weitghting on object's vertices.

But BLENDER SOURCE TOOLS already does that.

If any vertice of a mesh has more than 3 weight links (is rigged to more than 3 bones), Blender Source Tools will either tell you "too many weight links, you can't compile this model" or "too many weight links, I'll just cull it down to 3 for you" depending on the "weight link cull threshold" in the Source export properties, of which you are getting the second message. As long as you keep a Blender session of it, you should be fine.