How to control framerate in f4v/flv files in a Build / Flash process?

I am quite new to Encore and would kindly ask for an advice.
I am trying to build Flash material from projects, to be played from local PC, not necessary to be used as internet stream. In the final material I just run "index.html" and it plays in my local browser, say Google Chrome. I need that the generated f4v / flv video clips to be rendered in high quality (usually 1280x720 progressive) with framerates as high as 30 fps or 60 fps. Suppose I load  in Encore CS5 as asset an AVC mp4 clip rendered with 60fps. I select preset "1280x720 Widescreen High Quality". When executing "Build / Flash..." Encore produces a flv / f4v file with 25 fps. I cannot find where to control this aspect, I would like to endup with a f4v / flv clip with same framerate as the asset, in this case 60fps. Or at least 30fps. Any idea where to control this? I do not find any controls in Encore regarding this setting. Encore simply outputs 25fps flv clips, and sometime 15fps clips (I could not find out why 15fps...). Is there a way to force Encore to output flv clips with same framerate as the original asset?
Thanks in advance!

Thank you, Stan, for looking at this problem.
Yes indeed, Flash output in Encore is limited in many ways. I have done some experimenting now. It seemes I have found a nice application for Flash, but this application was not forseen by the developers of Encore, thus it is only poorly implemented. Unfortunately. Let me explain.
I produce multimedia material (video clips with film footage, still pictures & some effects) to be watched on PC with large screens or on PC & projector. Thus I need HD resolutions. At large resolution effects may sometimes not be perceived to run smoothly unless the video clips are rendered with high framerates. A trivial example would be rolling vertical credits at end of a video clip. When the clip is rendered with 25fps or lower you need to make the credits roll to run very slowly, otherwise the rolling down looks not smooth. Smoothiness gets better with material rendered at 29,97fps or 59,94 fps. I expected Encore would keep the framerate of the original asset when transcoding to Flash f4v / flv. This does not happen. I input assets (carefully observing the accepted input formats you mentioned) with high framerate, whereas Encore produced 25fps f4v files out of them. Unfortunately DVD formats have too low resolution for my intend and BR disks are not very popular where I live. I discovered that delivering material in Flash, to be played as an off-line website from local PC in the default browser - this would be a very nice solution. Unless Encore would perform better for this job. Probably it was simply not designed for this.
My first surprise was that I ended with 25fps f4v material. Trying to change this in Project Settings was not possible. Project was started in PAL and this option was now greyed out. Ok, I started a new project from the scratch as NTSC material, now at least the generated f4v files feature 29,97 fps instead of 25 fps, which would be acceptable. Unless...
The Flash transcoding machine of Encore drastically lowers bitrate for the generated f4v / flv files. I believe somewhere near 4Mbps (but may vary, I have not tested thoroughly). This can be ok for 360p material or lower resolution, or for watching video on youtube, but for HD resolution the effects look very bad and they do not run smooth at such low bitrate. I also noticed there is a problem with the Flash Player. The same generated (poor) f4v palyed in VLC or WMP looks much better than when played with Adobe Flash Player. Not to speak about difference between playing the original asset at 59,94fps with VLC versus playing the generated f4v (25fps) with Adobe Flash Player - here the difference is enormous!
It seemes I had some unrealistic expectations from Encore. I realy like the menus one can design with it, I like the possibility to build the project as Flash, but the results are quite poor. I need to look for an alternative solution.
When issuing the first post I just hoped I was doing something wrong...

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