Starcraft – How to spawn larvae without going back to base

You can't avoid to click, but you can click on the minimap.

If you select all your queens (say in a single control group) and cast spawn larva on the minimap, the closest queen will cast spawn larva on the closest hatchery to where you clicked.

This is another function of smart casting.

First,

initial rush survival

Spinecrawlers and properly microed speedlings and roaches can really help in pushing back this initial rush. Force the AI to funnel up the ramp and place the spinecrawlers behind gas and/or an evo chamber. If you scout it early, set your speedlings outside your base so when they attack you get an easy flank. Use multiple queens with transfusion to keep everything going. Remember you can use them even on your spinecrawlers.

In regards to

What t3 units complement a hydra-heavy build?

I think there is a fair amount of discussion about this but I personally find a lot of use with broodlords. A tier 3 unit, which is very powerful at wiping a ground army. I prefer to use them in team games as well. Excellent base assualt as well as support.

EDIT: In a recent match between Idra and Drewbie(?), Idra tech switched from Ultra to Broodlord and ended up finishing the matched. Had he switched earlier, it is speculated that he would have much sooner. More power to the broodies!