You can add it as a non steam game i got mine in there

And make an autoexec.cfg in the crysis 2 folder and add
g_skipintro=1

i have added it and it works fine every time ,let me find where the file is saved that i used to get it to work - will post back when found it

Youharddrive/programfiles(x86)/Electronicarts/crytek/crysis2/bin32/crysis2launcher if it doesnt appear in add non steam game , browse for this file , this is one i used and it is fine