I already requested (and it is probably in development) to have a option to imitate Tori's physics when it comes to Gravity (speed can be inverted already) on Uke.
There is no real sense on making them different. Physics are almost the same on both sides.
If you want to preview one or multiple flames in uke's side, open uke's custom folder and replace in the "FLAME 0;" field all those zeros with the numbers from the ingame flameforger in a consecutive order, separated by a space. Once you do it, save it and type /lp 1 uke.
My personal suggestion is creating a custom folder copying uke's or tori's one, so you can actually save somehow your designs (call those custom folders as "Flame1" or whatever, and then /lp 0 flame1).
If you want I could give you a preview of the whole process when I get home, with screenshots and stuff.
This way you can preview one or multiple flames which are not forged yet.