double spacebar click or hold spacebar jumps to start

I wonder if it would be possible to fix this issue, couldn't find it in the keyboard shortcuts so wonder if it is a bug. 
In any case it is very annoying that when you hold down spacebar too long or double click it, then you jump to the start of the song. We got w as a shortcut for that, don't really need another one... 

Happens for me too, feels glitchy.

I see this as to be expected if you have return to zero checked in the Preferences. Pressing the space bar plays Sonar pressing it again will stop it and RTZ. Holding is similar to that though I can't see where one would want to do that. Sonar is not a word processor. You will not be adding space to the time line by holding the space bar.

Right. Crtl + space will pause.

I use the space bar when auditioning clips and sometimes instead of one tap for stop then another to start again I'll hit them too quickly and rtz.

I can't find that in preferences? There is the normal toggle in the options menu, "on stop rewind to now marker".
Everything usually works as normal, spacebar will stop and return to the marker, or in case the other option is checked, the marker will move along playing and spacebar will stop on the current beat. It is only jumping to zero when spacebar is held for too long, or in my case accidentally double clicking spacebar when starting the song. (something that can be hard to avoid especially on big arrangements)

tlw
Holding the space bar will send Sonar multiple space bar clicks. How long you have to hold it for this to happen will be controlled by the Windows setting for character repeats when a (PC) key is held pressed.

Very good point. That is how repeating keys would work.