[maddinat0r]

Nice tutorial! But AFAIK strings are supported (you have to explicitly tag them though, like "inline Func(string:name)" (not sure if you have to add the brackets) and functions without parameters should work too (not quite sure about this though).
You also don't need to define "MYSQL_USE_YINLINE", just include "YSI/y_inline.inc" before including "a_mysql.inc", the MySQL include should automatically detect the y_inline include and enable support for inlined functions.