1kb RAM and 25k of flash is impressively low for Javascript engines for embedded system. I know it is still heavy for MCUs. Other JS engine implementations like Ducktape [1] and Jerryscript [2] takes more than 10kb of RAM and 150 of FLASH. Javascript is simply much heavier you might think. But I personally don't see any benefits neither.

[1] http://duktape.org/

[2] http://jerryscript.net/