Not as yet having seen, never mind being on a toilet, I can only offer the following comments:
First of all, it depends on the stand geometry.
Thus. for example, on an 1100RT or 1150RT, it is very easy, because the stand is perfectly positioned and leaves the bike like a rocking horse. You can stand on the pegs, and, with bike on stand, bike will be neutral to front wheel on ground. Sit down and rear wheel rests on ground.
So, to ride off, just sit you arse down and hit the go button.
Since either of these 2 bikes can also be put on the mainstand without dismounting, ( I am a shortarse)
I used regularly to stop with friends, put bike onto mainstand without dismounting, and when time came
to go, just ride off.
Bought a 1200 RT. in 39 years of riding, I have never encountered a worse positioned mainstand.
The geometry is poor, with stand positioned too far back. As a consequence, the bike is very difficult to get onto mainstand, requiring rider to dismount and heave till his nuts drop. Yes I know all about putting weight on stand peg etc, but it does not work on this bike.
Riding off stand is impossible unless you have circa 20 kg in top box. This is because the rear wheel will not touch the ground even with rider seated fully in pillion position. That's how far the stand is away from balance point.
If you have a suitable bike and wish to do it: Technique required: None. Just keep feet on footrests and take off as normal.
Myke