$5+0.50 rebuy frenzy on Pokerroom - how to play these situations

[bookish]

A couple of quick points.

You say shorties are pushing (presumably very light) from all over the place because they are needing to double up. This is the correct strategy from them.

You can expoit their wide pushing range by calling (or re-raising to isolate) with more marginal holdings that are ahead of their range.

Secondly as you hint you need to target who you look to steal blinds off. Big stacks have got the chips to look you up (or resteal back off you) and at the $5 level can be ludicrously loose. Short stacks are looking to double up, and will call quite light, but the medium stacks (like you are) should be your targets here.