Are you sure about that the starfox 2 flicker was fixed in a couple versions of wip zsnes and there source is avalible...Maybe it's not the right source?
I tried the newest WIP and this version and starfox 2 works fine in both.
February 19 2006 WIP
* ALL: Added gamma support to 16-bit new gfx engine [pagefault]
* ALL: SA1 IRQ timing/counter overflow fix, this should fix SA1 games that were previously freezing [pagefault]
* ALL: Timing fixes for games [pagefault]
* ALL: Remove FF3 hack, FF3 works perfectly now! [pagefault]
* ALL: FF3 cursor bug fixes, sprite rendering fixes to support RTO properly, ALL: FF3 mode 7 DMA timing fixings [pagefault]
* ALL: Fixed program counter in RET macro, Dirt Racer now plays with some blinking, making progress

[pagefault]
* ALL: M
ade STOP clear the IRQ flag when it's set, this fixes Star Fox 2 [pagefault]
* WIN: Fixed disable Screensaver option. [Jonas Quinn]
* GUI: Fixed Primary Buffer option. [Jonas Quinn]
Page it's on with source.
http://zsnes.ipherswipsite.com/Also I didn't see anyone answer my question if there is a place to download preview screenshot packs to use with this emulator.
Have you played it long enough to go to the first stage? Every version I played would allways crash on the map screen when picking a stage.
The flicker is fixed in several versions but the game allways crashes.