so, and sorry if this is a topic that's been dead for a while... if the Editor is rewriting your .ini file with RGSS104E.dll... isn't it doing that from a default source? I'm not sure but I think I found one of those sources in
C:\Windows\SysWOW and again in C:/Program Files (x86)/Enterbrain
Now... I don't know if I really WANT to make the full jump to have all my RMXP projects use the new engine, but... here's my thought. Going in and renaming that RGSS301.dll to RGSS104E or RGSS102E in sysWOW or the Enterbrain Program Files directory, and THEN create a BASIC implementation, just the scripts you need for this, the one map, and then adding the .rxdata you get from that to Enterbrain's data/system folders.
This way, you have exactly WHAT scripts you need at the onset, and when you click in the editor, and it goes and rewrites your RGSS301 with the one it has from the default source, it is rewriting with what YOU already changed.
I think this would be ideal for people who are ready to just make that big jump over to XPAce.