Notices

so now the only problem is that is there any way to re-confing keys in vgb,vgba and ines?

well can't you do it through the package manager?
Or else just try rootsh or the ssh server to get root access :-)

(OT: Is there still really a use for red pill or R&D except for very low level stuff?)

Red pill mode is usefull to install a .deb from file. Say you download it to your computer first then transfer to phone.

is there high chance that you'l brick your n900?
i tried rootsh but there was more apps but not vgb,vgba....

Enabling red pill mode does not give you more application choices it gives you more control of the device so of like a super user. I think the emulators your after are in the Extras repository which will need enabling to be able to try them. Be cautious though as all applications in there are still in beta testing so there may be some adverse effects. I personally have not had anything happen when using that repo but I accept the fact that playing around with experimental apps may lead to me reflashing the device.

well now i was able to install nes,gbc and gba. but when i tried to install snes it said missing libzeemote. but i cant find zeemote thing anywhere! and is there anyway to change keys in nes,gbc and gba because i have finnish phone and there isn't arrow keys?