I haven't used the online application. It's easier but I've tended to do the paper copy and take it to court myself. It's slightly more hassle as means photocopying it all three times and stapling it together (and it's thick to staple together). I understand from others, there's an option to add more on the online copy as well (for 5b - if it's called 5b on there).
If you're asking for less than about a third of the time then you would only be able to ask for your child to "spend time with" you and yes that would mean the Mother has "residency" - ie the lives with order.
You can ask for lives with both parents without it being 50/50 time but then it usually needs to be at least 5 nights a fortnight - which would be every other week-end (3 nights - Friday to Monday morning) and one midweek overnight plus half the holidays.
Personally I would ask for more than you want so you have room to negotiate down. I learned the hard way not wanting to seem to ask for too much. Don't ask, don't get and if you do ask you may get less than you asked for.
I think it's a good idea to ask for "lives with both parents" if you can do 5 nights a fortnight. It can help avoid some issues later if your ex is going to be a bit dictating. It makes you more equal in that neither of you is the "parent with care" - you both are. If the Mother has the lives with order she is also the "parent with care" and some Mothers can abuse that (eg tell schools not to include you in info or let you come to the school etc). The parent with care card can be quite powerful.
I think what you were saying earlier was you didn't think your ex would agree to a Wednesday night. So just ask for "a midweek night" and sort that out later. You have time to propose something more detailed later and tbh it really doesn't matter what your ex does midweek - she can change it. It's about what is the best schedule for the child. You're worrying that your ex won't agree to xyz. No she probably won't agree to anything but the court process will help. There can be negotiations before hearings (usually only if you use lawyers) and during those parents can both be pressured into compromising and reaching a reasonable agreement. If there are no negotiations and she doesn't agree to anything, the court will decide and the standard a court will order is every other week-end, a midweek night (usually Wednesday) and half the holidays.
So are you worried your ex will think you're trying to steal the child from her? One way round the Wednesday night issue would be if you ask for 50/50 - that would be two midweek nights and it would be the same two each week - either Monday and Tuesday or Wednesday and Thursday. Problem solved
. You have Monday and Tuesday each week. But I think you're not wanting 50/50 time is that right?
One option is what I have which is alternate Monday and Thursday nights. That was so my son didn't go more than 3 or 4 days without seeing me. So the Thursday night follows his week-end with me, then he comes on the Monday (after his week-end with ex) then to me on the Friday again for the week-end, then back on Thursday again.
That is not something that is usually ordered - they usually order the same night each week - it's more likely to get the alternate Mondays and Thursdays by agreement (but it's possible the court might order it if you give a good enough explanation and even say you're aware Wednesdays aren't good for the Mother). And your ex might even agree to those midweek nights if it suits her for it not to be wednesdays.
Before you can submit your application you need a mediation sign off that shows you've had a MIAM within the last 4 months signed by the mediator. So you might need to ask them if they can sign you off.