Is there some way to assign an entity action to an entity via a string?
Example: ent_create("grass.mdl",my.x,"grass");
If not, would it be possible to write a plugin in C++ that would be able to do so?

you could use the execute(""); function. This allows you to build strings containing commands and execute them. It's a bit tricky to use, and won't be available in Lite-C

you can try by str_cmpi:

string grass_str = "grass";
temp = str_cmpi(grass_str,"grass");
if(temp ==1){grass();}

but with using straight method... not sure

Simple answer: No, you need a function pointer.

Question: What do you want to achieve? maybe somebody around here knows another approach

Ok, it seems the execute function might do the job, but the function pointers might work better, if it works. The reason why I need it is quite complicated and I don't really feel like typing it all. In short I am working with arrays a lot and I need an array list of certain actions. So, the function pointers will probably work best.