So, is it dead? Rated 4 out of 5 stars

Erik is certainly an active guy as a dev. But Scriptish hasn't received any updates over 7months, and v1.8 branch haven't even started, not to mention some bugs in latest firefox versions (GM_log).

What future?

This review is for a previous version of the add-on (0.1.7). 

Not quite

I believe Nils has recently corrected the GM_log issue you mentioned. There should be a new version of Scriptish out in time for the general release of FF 17.

Great improvement over "rigid" Greasemonkey :) Rated 5 out of 5 stars

OK.
Scriptish targets Fox 4.0 - were toolbar buttons replaces "soo oldschool" statusbar icons + are superior (just because can be placed were user wishes).
Statusbar can be left for Seamonkey or older foxes, but a toolbar button is something very desirable. :)

Hope this will always stay in active development :P

This review is for a previous version of the add-on (0.1b4). 

Some new life poured into Greasemonkey? :P Rated 5 out of 5 stars

So far worked great for me but haven't tested it intensively yet.
It's great to see some improvements over "rigid" Greasemonkey UI.
Hope this will always stay in active development :P

BUG: on Minefield when trying to open options from Add-ons panel (about:addons) will cause freze.

This review is for a previous version of the add-on (0.1b3).