/jp/ - Otaku Culture

Is she using よう in the ように言う pattern described on DoJG? https://djt.neocities.org/bunpou/full_day.html#%E3%8A%A6%E3%82%88%E3%81%86%E3%81%AB%E8%A8%80%E3%81%86

Is she omitting the に part then? That isn't mentioned in either DoJT or JTMW.

For the 言っときなー　part, this is the ておく form, right? Why did she make a stem out of it? Is this a common way to make a suggestion or tell someone to do something?