1. Make it so if the other person hasn't poked you, in a week (or any moderately long period of time), you can poke them again. Spoiler: edit: already implemented 2. Make it so you can have a setting to disable pokes completely (currently all members, and members you follow) 3: Ignoring someone = no poking both ways
If someone doesn't poke you back, it may be because they do not want a poke war and just want to end it at that. Support for suggestion 2 only.