First of all, thanks for your feedback and your suggestions! 
I'm not sure how the modes operate, are they each exclusive ie manual mode on disables the other two.
No, they are only partly exclusive (e.g. when manual positioning - via your arrowkeys - is enabled, it no longer snaps to grid, but we will change that). Otherwise there are no such interdependencies.
Here I've placed a plank and am laying planks right to left, however when i select {LMB} the planks to the right are highlighted and i can't drag the mouse leftward in the direction I want. i'm not sure if it's dependant on the snapping/placement setup perhaps, if it is then the mode status box suggested above would help.
This part probably needs some rework, we will look at it once we have some time for that
The constructionsystem anyways still needs some tweaks.
That's not intended, we will fix that^^
4) Multiple sizing templates.
Hmm... originally we decided against this behaviour (determine the size of the plank when crafting), since we were afraid that it could be annoying when you maybe craft a stack of the wrong size (26x100cm vs. 27x100cm for example). It could also bloat your inventory when having too many stacks of different sized planks.
Maybe we can add a way to adapt a constructionelement to the size of an already placed element 
That's in the works
But the corner element of the ramp should fit at this marked location, at least for the lower element there:

It's technically not intended to have such a system in Rising World. We will add more blockshapes, as half blocks, but it's not planned to have a way to further reduce the size of the blocks. Alternatively we will add more construction elements in the future, which should help in that matter 
What's the best software for creating movies of gameplay, building tours etc.,
I've seen some games that incorporate such software in game are there any plans to add this feature to Rising world.
Maybe a Youtuber could give a good answer on this, I really can't recommend a specific software, since I simply don't know
It seems to depend on your system and many more aspects how good a particular capturingsoftware works. Make sure it has a good OpenGL and Java support.
But we will add some kind of cinematic mode in the future, allowing you to capture ingame videos and - for example - define a flyroute for the camera (the functionality for that is already implemented, and was used for our trailer, but it needs a more user-friendly way to handle it) 
Is there any mileage in adding a load/save feature for creative play.
We will think about it, for creative mode it could make sense.
is it possible to have an undo button to be effective in building mode
Yes, Undo/Redo is planned for the creative mode 
Just found the flashlight, shouldn't this be equipment rather than inventory. surely it's like a compass and clock.
Well, since you can't use the flashlight together with another item (e.g. the pickaxe is intended to be a two-handed item, that would be much more obvious when we have better animation [and hands xD]), it's not intended to be a equipment item (I doubt there are many situations when you have to use the flashlight for a few seconds only, like the clock). However, we will add other types of lights, like a helmetlamp for example, and they will be equipment items (i.e. you can use them together with other tools) 