Timeline in frames?

[potwnc]

Many of us now use PTE to produce video output (in fact I no longer create any .exe files). Most NLE (Non-Linear Editor) software allows the user to specify times in frames rather than seconds and fractions of a second. This makes more sense for video output. For example the PAL standard has 25 frames per second. If I want, say, a simple fade effect from slide A to slide B and my output will be PAL video it only makes sense for the duration of the effect to be in multiples of 1/25 of a second because for each 1/25 of a second the video will display an entire frame. For PAL video it's very easy to do the arithmetic but it gets much harder to do the same arithmetic for NTSC and 24p output.

Can we have a choice to set times in either seconds and fractions or in frames please?