OH! I know how!!!!!!!
Copy your hl.dll from valve folder and put it in your ctsrike/dlls folder( DO NOT OVERWRITE MP.DLL!)
+localinfo mm_gamedll dlls/hl.dll
Copy and paste that a the end of the "target" line in your shortcut to cs (if you dont use a shortcut make one)
Now you will have a counter strike that supports everything from Half Life and everything from Counter strike!!! Map some maps, insert some monsters, see if it works! (it should, Ive been able to combine dlls this way with bots and metamod etc)