Then when i go i editmode i make my selection. Then i hit tab and choose any transform mode (grab/scale/rotate) and do the action. But then, i can`t select any vertex/edge or face. I must go out of transform-mode, for example to 3d cursor and make a new selection.

I'm a bit confused here. You go into edit mode and make your selection (Vertices/Edges/Faces). Then you hit tab again? That will take you back to object mode. So Move/Rotate/Scale would not work on the components.

But if you are talking about the Active Tools for Move, Rotate & Scale. Then it's true. With any of those tools activated and with LMB Select, You can only click on 1 Vertex, 1 Edge, 1 Face and Shift + Left-Clicking again on another component does not add it to selection.

Here are the 2 fixes I've found for this.

1. Turn off Click Anywhere option for those Active Tools. This feature allows you to click-drag anywhere and activate the tool function. (Move/Rotate/Scale) --- LMB Click-Drag works just the same without it, but still lets you add/remove from selections.
2. Use Ctrl + Middle Mouse to Lasso Select and Add-Components. (If you still want to use Click Anywhere)

Hope this helps.

Hello,
thanks for fast answer. I searched for the "Click Anywhere" option but i can´t find it. Where can i toggle this on/of?

It's in the tool settings and the top bar when using any of the transform tools, but it's not a real viable solution because you still get conflicts, and most tools completely override the left click behaviour.

Ok, thanks. I hope this issue will be fixed to the release. I can´t use the right select version, because it´s too confusing, when i work with different apps.

But thanks again for the fast answers

Yes, that's why you would probably like to use the Industry Standard keymap, which makes Blender act more like other apps, with left click to select and left click tools and so on. It will be included with Blender 2.8.

@Michael Benoist (gopper0815) Glad we could help Michael. :) @William Reynish (billreynish) Oh, William. When will this teasing for the ISK (Industry Standard Keymap) end mate? :D Listening to you talk about it functionally almost everyday, I really can't wait to start using it! >Insert Pls Gib ISK Emote< :)

There are some changes needed in Blender's source code to support it. I can't implement it yet. We should then take a hard look at the old left click select option in Blender. It never worked well, and is much worse now.