I do this weird thing where if I need small quick adjustments I twist my mouse rather than move it.
My technique is terrible.
In normal PC mode I rest my palm on the mouse and move my arm to navigate around the screen (35").
In gaming mode, I adopt a claw grip and my wrist stays put, and even though I have a 120cm x 60cm full sized desk mat, my mouse barely moves outside a 3" x 1" box (I'm conversant in both metric and imperial)
I still make rollies on my mousemat - I do find I have good aim after hoovering the mousemat for about an hour 
I'd recommend going down the vape route rather than combustion. Your lungs will thank you for it, and there's very little smell.
My weapon of choice when vaping is a Storz & Bickel Volcano. I've been using the Hybrid for years, and before that I had a classic and a few other sub-par devices.
For portability I use an Arizer Solo II. I also have a S&B Mighty, but prefer the Solo as it's a cooler draw and just feels better in the hand.
You can buy attachments for micro-dosing 0.15g per session. I tend to do this for a while before removing it and packing the bowl to the gunwales
You can also carry a balloon full of vaped material from room to room.
Here's one I prepared earlier
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