Yeah I just took 3 panorama photos in a row successfully
Edit: Panorama mode is sensitive to vertical movement though for me when taking it, does the HTC one have an image stabilizer? Just took another 4

HDR works well so does gif mode but fast burst only takes 2 shots after hearing shutter sound many times as mentioned in OP. Flash is disabled when opening camera at 14% battery but the HTC flashlight app still works.
More of a work around than a fix but I haven't came across this yet, as in Sense 4+ for example when accessing recent apps or some others had with entering clock widget or using a screen (night) filter then sense scrolling between home screens would lag a bit if not disabling hw overlays. But on this ROM I find is just after rebooting for a few seconds but that is nothing out of the ordinary as many things are loading in background. How do you reproduce the low frame rate of home screen or notification bar? I think pulling down the notification bar is the fastest I've experienced.
Sent from my HTCSensation
---------- Post added at 05:21 PM ---------- Previous post was at 05:05 PM ----------
Done via the stock keyboard by long pressing 12# button on bottom left of keyboard but if you use a third party keyboard there isn't another option for it. If the Venom tweak could be added back to swap the attachment button to the smilies button like in older previous ViperS ROMs, would solve this.
I think you can manually enter them though.
Sent from my HTCSensation