Artyboots

2) Design Gallery > More... > Find...

3) Unless I have missed a change, you can not build your own templates. Just save your designs as a normal .web and copy and paste from that into your new .web file.
If you've created a colour scheme it gets copied across but I recall it can get messy; there is a Post on Talkgraphics somewhere.

Acorn

P.S. in XDWX, you do have the File > Save Template... option.