improved timerange behaviour

[dotob]

(Prio 2) Moreover, I am looking for a possibility to enter a second (third...) start time in the day to spare me the calculation of the duration

I'd like to be able to do the following entries:

9:30-10:30;emon(+2, Moni, activity planning),
11:30-12;50010(config, FISH parsing JBB),
13:45,0.25;50812-0(tel RP,FF active/active doc YapiKredi),
15-17;50030-0(Urlaub)

I know that one of the main ideas was to enter durations rather then start and end time, but I hope that Moni could cope with both notations.
Because for consultants like me the main idea is to use Moni offline, though we may have a lot of tasks. It's easier for me to write
when did I start to travel, when did I arrive at the customer, when did I left, when did I arrive at home, duration I would have to calculate
Like this:
8:30-;sns(+ travel to Amsterdam),
10:30-;sns(+ workshop)
17-;sns
-19;sns(+ travel to Aachen)

instead of
8:30,2;sns(+ travel to Amsterdam),
4;sns(+ workshop)
0.5;sns
2;sns(+ travel to Aachen)