I got functions' list, coming into plugin through RegisterCallback() in v.14.0.6.1988.
Unknown functions for me are: 155, 170, 171, 172, 177, 290, 291
178 is
int (*IDE_GetAppHandleEx)() = (int(*)()) 178;
178 : @IDE_GetAppHandleEx := Addr;
it is described in \PlugInDoc\Interface\PlugInIntf.pas
155 seems to be IDE_SetSelectedText(char*) don't know what it returns;
170 is IDE_MainApplication() without parameters, returns pointer to some heavy struct;
171 is IDE_MainForm() - no params, return - ?;
172 IDE_Mouse() - seems to have one 32-bit parameter;
177 IDE_GetSyntaxAnalyzer() - 1 out parameter and some return value;
290 unnamed function, returning some flag, based on some internal variable;
291 much more complex unnamed function with 1 out param.