First: What is your host system? Are you running Basilisk II in Windows?
If it is not in the new builds, it probably won't come back. Basilisk II is not being very actively developed. Work on the emulator now is more for maintenance purposes.
But maybe if someone who is doing some of that maintenance sees your post here, some of that old code could be re-inserted. Maybe. But don't hold your breath.
That game should run fine in Basilisk II build 142 in Windows as long as you check that box for more complete mouse, by the way. It is mentioned in our compatibility notes:
http://www.emaculation.com/doku.php/com ... ty_sheet#a
In case you don't have it, build 142 is here: